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NCERT Exemplar Class 9 Science Solutions Chapter 3 Atoms and Molecules

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NCERT Exemplar Class 9 Science Solutions Chapter 3 Atoms and Molecules

Edited By Sumit Saini | Updated on Sep 01, 2022 01:08 PM IST

NCERT exemplar Class 9 Science solutions chapter 3 deals with basic constituents of any substance or compound which is an atom. The combination of these atoms makes a molecule which in turn combines to make a substance. The NCERT exemplar Class 9 Science chapter 3 solutions are prepared by a skilled team of subject matter experts to ensure accurate and comprehensive learning of NCERT Class 9 Science. These Class 9 Science NCERT exemplar chapter 3 solutions clarify any doubts or queries as they provide a step-by-step approach to the basics of atoms and molecules. The NCERT exemplar Class 9 Science solutions chapter 3 are designed to cover all the topics of the CBSE Syllabus for Class 9 Chapter 3.

NCERT Exemplar Class 9 Science Solutions Chapter 3-MCQ

Question:1

Which of the following correctly represents 360 g of water?
(i) 2 moles of H_{2}O
(ii) 20 moles of water
(iii) 6.022 \times 10^{23} molecules of water
(iv) 1.2044\times10^{25} molecules of water

(a) (i)
(b) (i) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
Answer: D
The average mass of one mole of H_{2}O is 18.02 grams.
The molecular weight of water is 18 g/mol. Hence, one mole of water weighs 18 g.
One mole of water contains 6.023 \times 10^{23} water molecules.
2 moles of H_{2}O is 36 g (2 \times 18 g) and 20 moles of water is 360g (20 \times 18 g). The mass of 6.022 \times 10^{23} molecules of water is 18g.
Therefore, the mass of 1.2044\times10^{25} molecules (= 20 \times 6.022 \times10^{23} molecules) of water is 20 \times 18g = 360g.

Question:2

Which of the following statements is not true about an atom?
(a) Atoms are not able to exist independently
(b) Atoms are the basic units from which molecules and ions are formed
(c) Atoms are always neutral in nature
(d) Atoms aggregate in large numbers to form the matter that we can see, feel or touch
Answer: A
Atoms are not able to exist independently is not true, Atoms of most elements are not able to exist independently but inert gases can exists as atoms.

Question:3

The chemical symbol for nitrogen gas is
(a) Ni (b) N_{2} (c) N^{+} (d) N
Answer: B
Chemical formula of Nitrogen is N but nitrogen exist as a molecule of two atoms. Therefore, the chemical symbol of nitrogen gas is N_{2}

Question:4

The chemical symbol for sodium is
(a) So (b) Sd (c) NA (d) Na
Answer: D
Sodium word is derived from Latin word Natrium hence the chemical name of sodium is Na.

Question:5

Which of the following would weigh the highest?
(a) 0.2 mole of sucrose (C_{12} H_{22} O_{11})
(b) 2 moles of CO_{2}
(c) 2 moles of CaCO_{3}
(d) 10 moles of H_{2}O
Answer: C
From mole concept,
1 mole = molecular weight in gram.
Weight of a sample in gram = Number of moles × Molar mass
Mass of 1 mole of sucrose (12 \times 12) + (1 \times 22) + (16 \times 11) = 342 g
Mass of 1 mole of CO_{2} = 12 + (16 \times 2) = 44g
Mass of 1 mole of CaCO_{3} = 40 + 12 + (16 \times 3) = 100g
Mass of 1 mole of H_{2}O = 2 + 16 = 18g
(a) 0.2 moles of C_{12} H_{22} O_{11} = 0.2 \times 342 = 68.4 g
(b) 2 moles of CO_{2} is 2 \times 44 = 88 g
(c) 2 moles of CaCO_{3} = 2 \times 100 = 200 g
(d) 10 moles of H_{2}O = 10 \times 18 = 180 g

Question:6

Which of the following has maximum number of atoms?
(a) 18g of H_{2}O
(b) 18g of O_{2}
(c) 18g of CO_{2}
(d) 18g of CH_{4}
Answer: D
N_{A} = 6.023 \times 10^{23}
(a) 18 g of water =18 \times \frac{3}{18}\times N_{A} = 3 N_{A}
(b) 18 g of oxygen = 18 \times \frac{3}{32} \times N_{A} = 1.12 N _{A}
(c) 18 g of CO_{2} = 18 \times \frac{3}{44} \times N_{A} = 1.23 N_{A}
(d) 18 g of CH_{4} =18\times \frac{5}{16}\times N_{A} = 5.63 N_{A}

Question:7

Which of the following contains maximum number of molecules?
(a) 1g CO_{2}
(b) 1g N_{2}
(c) 1g H_{2}
(d) 1g CH_{4}
Answer: C
Molar mass of other molecules are much higher than given mass, so number of molecules in them will be less than that in hydrogen.
1 g of H_{2} = \frac{1}{2} \times N_{A}
= 0.5 N_{A}
= 0.5 \times 6.022 \times 10^{23}
= 3.011 \times 10^{23}

Question:8

Mass of one atom of oxygen is
(a) \frac{16}{6.023\times10^{23}}g
(b) \frac{32}{6.023\times10^{23}}g
(c) \frac{1}{6.023\times10^{23}}g
(d) 8u
Answer:
Mass of one atom of oxygen =\frac{Atomic \;mass}{N_{A}}
=\frac{16}{6.023\times10^{23}}g

Question:9

3.42 g of sucrose are dissolved in 18g of water in a beaker. The number of oxygen atoms in the solution are
(a) 6.68\times 10^{23}
(b) 6.09\times 10^{22}
(c) 6.022\times 10^{23}
(d) 6.022\times 10^{21}
Answer: A
1 mol of sucrose ( C_{12}H_{22}O_{11}) contains = 11\times N_{A} atoms of oxygen,
Here, N_{A} = 6.023\times10^{23}


    1. mol of sucrose ( C_{12}H_{22}O_{11}) contains = 0.01 \times 11 \times N_{A} atoms of oxygen
       = 0.11\times N_{A}=0.11\times N_{A} atoms of oxygen
      =18 g/(1\times2+16)gmol-1
      = 1mol
      1mol of water (H_{2}O)contains 1 \times N_{A} atom of oxygen
      Total number of oxygen atoms = Number of oxygen atoms from sucrose + Number of oxygen atoms from water
      = 0.11 N_{A} + 1.0 N_{A}
      ?????=1.11 N_{A}=1.11 N_{A}
      Number of oxygen atoms in solution
      =1.11 \times Avogadro’s number
      =1.11 \times 6.022 \times 10^{23}=6.68\times 10^{23}

Question:10

A change in the physical state can be brought about
(a) only when energy is given to the system
(b) only when energy is taken out from the system
(c) when energy is either given to, or taken out from the system
(d) without any energy change

Answer: C
A change in the physical state can be brought about when energy is either given to, or taken out from the system. When a solid change into liquid, it absorbs energy. It is because, energy change helps in changing the magnitude of attraction forces between the particles, thus helps in changing the physical states (i.e., solid, liquid, gas) of matter. When a liquid change into solid, it releases energy.

NCERT Exemplar Class 9 Science Solutions Chapter 3-Short Answer

Question:11

Which of the following represents a correct chemical formula? Name it.
(a) CaCl
(b) BiPO_{4}
(c) NaSO_{4}
(d) NaS

Answer: B
The correct formula is CaCl2 (valency of Ca = 2, valency of Cl = 1).
The correct formula is Na_{2}SO_{4} (valency of Na = 1, Valency of SO_{4} = 2).
The correct formula is Na_{2}S (valency of Na = 1, valency of sulphide = 2).
BiPO_{4}, is the correct formula, its name is bismuth phosphate. Bismuth phosphate is right because both ions are trivalent.

Question:12

Write the molecular formulae for the following compounds
(a) Copper (II) bromide
(b) Aluminium (III) nitrate
(c) Calcium (II) phosphate
(d) Iron (III) sulphide
(e) Mercury (II) chloride
(f) Magnesium (II) acetate

Solution:
(a) Copper(II) Bromide – CuBr_{2}
(b) Aluminium(III) nitrate – Al (NO_{3})_{3}
(c) Calcium (II) phosphate – Ca_{3}(PO_{4})_{2}
(d) Iron(III) sulphide – Fe_{2}S_{3}
(e) Mercury(II) chloride – HgCl_{2}
(f) Magnesium(II) acetate – Mg(CH_{3}COO)_{2}

Question:14

Write the cations and anions present (if any) in the following compounds
(a) CH_{3}COONa
(b) NaCl
(c) H_{2}
(d) NH_{4}NO_{3}

Solution.
Anions Cations
(a) CH_{3} COO^{-} Na^{+}
(b) Cl^{-} Na^{+}
(c) It is a covalent compound
(d) NO_{3}^{-} NH_{4}^{+}

Question:15

Give the formulae of the compounds formed from the following sets of elements
(a) Calcium and fluorine
(b) Hydrogen and Sulphur
(c) Nitrogen and hydrogen
(d) Carbon and chlorine
(e) Sodium and oxygen
(f) Carbon and oxygen

Answer:
(a) Calcium and fluoride - Calcium Fluoride (CaF_{2})
(b) Hydrogen and sulphur - Hydrogen Sulphide (H_{2}S)
(c) Nitrogen and hydrogen - Ammonia (NH_{3})
(d) Carbon and chlorine - Carbon Tetrachloride (CCl_{4})
(e) Sodium and oxygen - Sodium Oxide (Na_{2}O)
(f) Carbon and oxygen - Carbon dioxide (CO_{2}); Carbon Monoxide (CO)

Question:16

Which of the following symbols of elements are incorrect? Give their correct symbols
(a) Cobalt CO
(b) Carbon c
(c) Aluminum AL
(d) Helium He
(e) Sodium So

Answer:
(a) Incorrect, the correct symbol of cobalt is Co
(b) Incorrect, the correct symbol of carbon is C
(c) Incorrect, the correct symbol of aluminum is Al
(d) Correct (He)
(e) Incorrect, the correct symbol of sodium is Na

Question:18

State the number of atoms present in each of the following chemical species
(a) CO_{3}^{2-}
(b) PO_{4}^{3-}
(c) P_2O_5
(d) CO

Solution.
(a) CO_{3}^{2-} = 1C + 3(O) = 4
(b) PO_{4}^{3-} = 1P + 4(O) = 5
(c) P_{2}O_{5} = 2P + 5(O) = 7
(d) CO = 1C + 1(O) = 2

Question:19

What is the fraction of the mass of water due to neutrons?
Solution.
In water molecule (H_{2}O), number of neutrons = [(number of neutrons in H) \times2+ (number of neutrons in O)]
= 0\times 2 + 8 = 8(as number of
neutrons in H = 0)
Mass of 8 neutrons = 8\times 1.00893 = 8.07 (mass of one neutron = 1.008934)

Molar mass of water = 1.008\times 2 + 16.0 = 18.016 u
There are 8 neutrons in one atom of oxygen
Mass of 8 neutrons=\frac{8}{N_{A}} g
Fraction of mass of water due to neutrons = \frac{8}{18}

Question:20

Does the solubility of a substance change with temperature? Explain with the help of an example.
Solution.
Yes, the solubility of a substance depends on its temperature. The solubility of solids in liquids usually increases on increasing the temperature and decreases on decreasing the temperature. The solubility of gases in liquids usually decreases on increasing the temperature and increases on decreasing the temperature.
For example, one can dissolve more sugar in hot water than in cold water.

Question:21

Classify each of the following on the basis of their atomicity.
(a) F_{2}
(b) NO_{2}
(c) N_{2}O
(d) C_{2}H_{6}
(e) P_{4}
(f) H_{2}O_{2}
(g) P_{4}O_{10}
(h) O_{3}
(i) HCl
(j) CH_{4}
(k) He
(l) Ag

Answer:
(a) Diatomic (2 atoms)
(b) Triatomic (3 atoms)
(c) Triatomic (3 atoms)
(d) Polyatomic (8 atoms)
(e) Polyatomic (4 atoms)
(f) Polyatomic (4 atoms)
(g) Polyatomic (14 atoms)
(h) Triatomic (3 atoms)
(i) Diatomic (2 atoms)
(j) Polyatomic (5 atoms)
(k) Monoatomic (1 atom)
(l) Monoatomic (1 atom)

Question:22

You are provided with a fine white colored powder which is either sugar or salt. How would you identify it without tasting?

Answer.
There are many ways by which we can differentiate between sugar and salt without testing. We can identify the powder by heating. The powder will char if it is a sugar. Dissolve salt and sugar separately in alcohol, sugar will be dissolved in it while salt will not be dissolved. the powder can be dissolved in water and checked for electrical conductivity. If it conducts, then the powder is salt.

Question:23

Calculate the number of moles of magnesium present in a magnesium ribbon weighing 12 g. Molar atomic mass of
magnesium is 24\;g \;mol^{-1}.

Answer:
Weight of a sample in grant = Number of moles × Molar mass
Atomic mass of Mg = 24 g mol^{-1}
24 g of Mg = 1 mol
12 g of Mg = 12/24 = 0.5 mol

NCERT Exemplar Class 9 Science Solutions Chapter 3-Long Answer

Question:24

Verify by calculating that
(a) 5 moles of CO_{{2}} and 5 moles of H_{2}O do not have the same mass.
(b) 240 g of calcium and 240 g magnesium elements have a mole ratio of 3:5.

Answer:
(a) CO_{2} has molar mass = 44g mol^{-1}
5 moles of CO_{2} have molar mass = 44 \times 5 = 220 g
H_{2}O has molar mass = 18 g mol^{-1}
5 moles of H_{2}O have mass = 18 \times 5 g = 90 g
Hence, they do not have same mass.
(b) Number of moles in 240g Ca metal =\frac{240}{40} = 6
Number of moles in 240g of Mg metal =\frac{240}{24} = 10
Ratio 6:10 = 3: 5

Question:27

The difference in the mass of 100 moles each of sodium atoms and sodium ions is 5.48002 g. Compute the mass of an electron.
Answer:
Number of electrons in Na atom = 11
Number of electrons in Na^{+} = 10
For 1 mole of Na atom and Na+ the difference in electrons = 1 mole
For 100 moles of Na atoms and Na+ ions the difference = 100 moles of electrons
Mass of 100 moles of electrons = 5.48002 g
Mass of 1 mole of electrons =\frac{5.48002}{100}g
Mass of one electron =\frac{5.48002}{100\times6.022\times10^{23}}g
=9.1\times10^{-28}g
=9.1\times 10^{-31}kg

Question:29

The mass of one steel screw is 4.11g. Find the mass of one mole of these steel screws. Compare this value with the mass of the Earth (5.98 \times 10^{24}kg). Which one of the two is heavier and by how many times?
Answer:

One way of srews weigh =2.475\times 10^{24}g
=2.475\times 10^{21}kg
\frac{Mass \;of\; the\; earth}{Mass\; of\; one\; mole\; of\; screws}=\frac{5.98\times 10^{24}}{2.475\times 10^{21}}=2.4\times 10^{3}
Mass of earth is 2.4 \times 10^{3} times the mass of screws. The earth is 2400 times heavier than one mole of screws

Question:30

A sample of vitamic C is known to contain 2.58 \times10^{24}oxygen atoms. How many moles of oxygen atoms are present in the sample?
Answer:

1 mole of oxygen atoms = 6.023 \times 10^{23} atoms
∴ Number of moles of oxygen atoms =\frac{2.58\times 10^{24}}{6.023\times 10^{23}}
=4.28moles

Question:31

Raunak took 5 moles of carbon atoms in a container and Krish also took 5 moles of sodium atoms in another container of same weight. (a) Whose container is heavier? (b) Whose container has more number of atoms?
Solution.
(a) Mass of sodium atoms carried by Krish = (5 \times 23) g = 115 g
While mass of carbon atom carried by Raunak = (5 \times12) g = 60g
Thus, Krish’s container is heavy.
(b) As the two bags have the same number of moles of atoms, both the bags will have the same number of atoms.

Question:33

The visible universe is estimated to contain 10^{22} stars. How many moles of stars are present in the visible universe?
Answer:
1 mole of stars equals 6.023\times10^{23}
Number of moles of stars =\frac{10^{22}}{6.022\times 10^{23}}
Number of moles of stars = 0.0166

Question:34

What is the SI prefix for each of the following multiples and submultiples of a unit?
(a) 10^{3} (b) 10^{-1} (c) 10^{-2} (d) 10^{-6}
(e) 10^{-9} (f) 10^{-12}

Answer:
(a) kilo10^{3}
(b) deci10^{-1}
(c) centri10^{-2}
(d) micro10^{-6}
(e) nano10^{-9}
(f) pico10^{-12}

Question:36

Compute the difference in masses of 10^3 moles each of magnesium atoms and magnesium ions. (Mass \: of \: an\: electron = 9.1\times 10^{-31} kg)
Answer:

Mg^{2+}ion and Mg atom differ by two electrons.
10^3 moles of Mg^{2+} and Mg atoms would differ by 2 \times 10^3 moles of electrons.
Mass of 2 \times 10^3 moles of electrons.
= 2 \times 10 ^3 \times 6.023 \times 10^{23} \times 9.1 \times 10^{-31} kg
\Rightarrow 2 \times 6.022 \times 9.1 \times 10^{-5} kg
\Rightarrow 109.6004 \times 10^{-5} kg
\Rightarrow 1.096 \times 10^{-3} kg

Question:37

Which has more number of atoms?
100g \: \: of \: \: N_2 \: \: or\: \: 100 g\: \: of \: \: NH_3

Answer:

(i)100g\: \: of\: \: N_2 = \frac{100}{28}moles
Number \: of \: molecules = \frac{100}{28} \times 6.022 \times 10 ^{23}
Number \: of \: atoms = \frac{2 \times 100}{28} \times 6.022 \times 10 ^{23}
=43.01 \times 10^{23}
(ii)100g\: \: of\: \: NH_3 = \frac{100}{17}moles
Number \: of \: molecules = \frac{100}{17} \times 6.022 \times 10 ^{23} Number \: of \: atoms = \frac{4 \times100}{28} \times 6.022 \times 10 ^{23}
=141.69 \times 10^{23}
NH_3 will have more atoms.

Question:38

Compute the number of ions present in 5.85 g of sodium chloride.
Answer:
5.85g of NaCl=\frac{5.85}{58.5}=0.1moles
Or, 0.1 moles of NaCl particles.
Each NaCl particle is equivalent to one Na^{+} one Cl^{-} i.e. 2 ions.
Total moles of ions = 0.1 \times 2 = 0.2 moles
No. of ions = 0.2 \times 6.022 \times 10^{23} = 1.2042 \times 10^{23} ions

Question:39

A gold sample contains 90\% of gold and the rest copper. How many atoms of gold are present in one gram of this sample of gold?

Answer:
One gram of gold sample will contain \frac{90}{100}=0.9g of gold
Number of moles of gold =\frac{Mass\; of \;gold}{Atomic\; mass\; of\; gold}
=\frac{0.9}{197}
=0.0046
One mole of gold contains N_{A} atoms =6.022\times 10^{23}
\therefore0.0046mole of gold will contain =0.0046\times 6.022\times10^{23}atoms
=2.77\times10^{21}atoms

Question:40

What are ionic and molecular compounds? Give examples.
Answer:
While forming some compounds, atoms may gain or lose electrons, thereby forming electrically charged particles called ions. Compounds that are formed by the attraction of cations and anions are known as ionic compounds.
Ex : 2Na + Cl_2 \rightarrow 2Na + Cl^{-} \rightarrow 2NaCl (sodium chloride- common salt.)
Compounds formed by the bonding of uncharged species are known as molecular compounds. The bonding is called covalent bonding. Molecular compounds are formed by sharing of electrons between the two atoms. Ex: 2C + O_{2} \rightarrow 2CO (Carbon monoxide)

Question:41

Compute the difference in masses of one mole each of aluminum atoms and one mole of its ions.
\left ( Mass \: \: of\: \: an\: \: electron\: \: is\: \: 9.1 \times 10^{-28} g \right ) Which one is heavier?

Answer:

Ionization of Al atom occurs as
Al\rightarrow Al^{3+}+3e^-
Therefore, Al^{3+} ion is formed from Al atom by loss of 3 electrons. Difference in mass of 1 mole of Al atoms and 1 mole of Al^{3+} ions
= mass\: \: of \: \: 3 \times 6.022 \times 10^{23} electrons
= (3 \times 6.022 \times 10^{23}) \times (9.1 \times 10^{-28} g)
(as \: \: mass\: \: of\: \: an \: \: electron = 9.1 \times 10^{-28} g)
=164.4 \times 10^{-5}g=1.644 \times 10^{-3}g
1 mole of Al atoms is heavier than 1 mole of Al^{3+} ions.
It is because 1 mole of Al atom have e^-= 13\times 6.022 \times 10^{23 } electrons and 1 mole of Al ion have
e=10\times 6.022 \times 10^{23 } electrons

Question:42

A silver ornament of mass’m’ gram is polished with gold equivalent to 1% of the mass of silver. Compute the ratio of the number of atoms of gold and silver in the ornament.
Answer:
Mass of silver =mg
Mass of gold deposited =\frac{m\times1}{100}=\frac{m}{100}g
No. of atoms of silver =\frac{Mass}{Atomic mass}\times N_{A}=\frac{m}{108}\times N_{A}
No. of atoms of gold =\frac{Mass}{Atomic mass}\times N_{A}=\frac{m}{100\times 197}\times N_{A}
Ratio of the number of atoms of gold to silver =\frac{m}{100\times 197}\times N_{A}:\frac{m}{108}\times N_{A}
108:100\times 197=108:19700=1.182.41

Question:44

Fill in the blanks
(a) In a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is called ————.
(b) A group of atoms carrying a fixed charge on them is called ————.
(c) The formula unit mass of Ca_3 (PO_4)_2 is ————.
(d) Formula of sodium carbonate is ———— and that of ammonium sulphate is ————.

Answer:

(a) In a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is called Law of conservation of mass.
It states that mass is neither created nor destroyed in chemical reactions.
(b) A group of atoms carrying a fixed charge on them is called ions.
An ion is a charged atom or molecule. It is charged because the number of electrons are not equal to the number of protons in the atom or molecule.

(c) The formula unit mass of Ca_3(PO_4)_2 is 310.
Ca_3 (PO_4)_2 = (40) 3 + [31 + (16) 4] 2 = 120 + 190 = 310
(d) Formula of sodium carbonate is Na_2CO_3 and that of ammonium sulphate is (NH_4)_2SO_4

NCERT Exemplar Solutions Class 9 Science Chapter 3 Important Topics:

NCERT exemplar Class 9 Science solutions chapter 3 includes the following topics :

  • Definitions of atoms and molecules.
  • The fundamental quantity which defines the amount of substance is called a mole.
  • Molecular weight and atomic weight of any substance.
  • How to find out the molecular weight of any compound if we know the chemical formula of the compound.
  • NCERT exemplar Class 9 Science solutions chapter 3 discusses the Avogadro number which will tell a number of atoms or molecules in one mall of the substance.
  • Study of the molecules and atoms and their molecular weight.

NCERT Class 9 Exemplar Solutions for Other Subjects:

NCERT Class 9 Science Exemplar Solutions for Other Chapters:

Features of NCERT Exemplar Class 9 Science Solutions Chapter 3:

These Class 9 Science NCERT exemplar chapter 3 solutions provide a basic understanding of atoms and molecules. This chapter discusses different chemical formulas for different type of compounds and enables a student to judge if the chemical formula given is correct or not. Atoms and Molecules can be practiced by the students of Class 9 through these NCERT exemplar Class 9 Science solutions chapter 3 and can be leveraged to solve other reference books such as NCERT Class 9 Science TextBook, Lakhmir Singh and Manjit Kaur by S. Chand et cetera.

NCERT exemplar Class 9 Science solutions chapter 3 pdf download enables the students to download/view these solutions in an offline environment while studying NCERT exemplar Class 9 Science chapter 3.

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Frequently Asked Question (FAQs)

1. Q1. What is Avogadro’s number?

A1. Avogadro number tells us a number of molecules or atoms in one mole of substance

Its value is 6.023×1023. For example, molecular weight of water is 18 therefore one mole of water will have 18 g and it will have number of water molecules equal to Avogadro number.

2. Q2. Does oxygen exist in atomic form?

A2. No, oxygen does not exist in the atomic form in nature. Oxygen exists either in the form of a diatomic molecule or triatomic molecules. They are called oxygen gas and ozone respectively.

3. Q3. 2 g of oxygen and 2 g of helium gas are kept in a chamber. What is the ratio of their moles?

A3. The molecular weight of oxygen is 32 therefore 2 g of oxygen will have 1 /16 moles.

The molecular weight of helium is four therefore 2 g of helium will have 1 /2 moles.

Hence, in the mixture, the ratio of oxygen and helium will be 1:8.

4. Q4. Does the atomic weight of any atom change when it gets ionised?

A4. The atomic weight of any atom does not change when it gets ionised. In ionisation, only electrons are transferred which have negligible weight. Thus, they do not affect the atomic weight of the atom.

5. Q5. How many questions are expected from the chapter on Atoms and Molecules?

A4. Generally, the CBSE pattern suggests that the final paper for Class 9 should consist of a mixture of objective type (1 question) and short answer type(2 questions). A student going with the NCERT exemplar Class 9 Science solutions chapter 3 thoroughly can easily score well in the final paper 

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A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is

Option 1)

0.34\; J

Option 2)

0.16\; J

Option 3)

1.00\; J

Option 4)

0.67\; J

A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times.  Assume that the potential energy lost each time he lowers the mass is dissipated.  How much fat will he use up considering the work done only when the weight is lifted up ?  Fat supplies 3.8×107 J of energy per kg which is converted to mechanical energy with a 20% efficiency rate.  Take g = 9.8 ms−2 :

Option 1)

2.45×10−3 kg

Option 2)

 6.45×10−3 kg

Option 3)

 9.89×10−3 kg

Option 4)

12.89×10−3 kg

 

An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

Option 1)

2,000 \; J - 5,000\; J

Option 2)

200 \, \, J - 500 \, \, J

Option 3)

2\times 10^{5}J-3\times 10^{5}J

Option 4)

20,000 \, \, J - 50,000 \, \, J

A particle is projected at 600   to the horizontal with a kinetic energy K. The kinetic energy at the highest point

Option 1)

K/2\,

Option 2)

\; K\;

Option 3)

zero\;

Option 4)

K/4

In the reaction,

2Al_{(s)}+6HCL_{(aq)}\rightarrow 2Al^{3+}\, _{(aq)}+6Cl^{-}\, _{(aq)}+3H_{2(g)}

Option 1)

11.2\, L\, H_{2(g)}  at STP  is produced for every mole HCL_{(aq)}  consumed

Option 2)

6L\, HCl_{(aq)}  is consumed for ever 3L\, H_{2(g)}      produced

Option 3)

33.6 L\, H_{2(g)} is produced regardless of temperature and pressure for every mole Al that reacts

Option 4)

67.2\, L\, H_{2(g)} at STP is produced for every mole Al that reacts .

How many moles of magnesium phosphate, Mg_{3}(PO_{4})_{2} will contain 0.25 mole of oxygen atoms?

Option 1)

0.02

Option 2)

3.125 × 10-2

Option 3)

1.25 × 10-2

Option 4)

2.5 × 10-2

If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

Option 1)

decrease twice

Option 2)

increase two fold

Option 3)

remain unchanged

Option 4)

be a function of the molecular mass of the substance.

With increase of temperature, which of these changes?

Option 1)

Molality

Option 2)

Weight fraction of solute

Option 3)

Fraction of solute present in water

Option 4)

Mole fraction.

Number of atoms in 558.5 gram Fe (at. wt.of Fe = 55.85 g mol-1) is

Option 1)

twice that in 60 g carbon

Option 2)

6.023 × 1022

Option 3)

half that in 8 g He

Option 4)

558.5 × 6.023 × 1023

A pulley of radius 2 m is rotated about its axis by a force F = (20t - 5t2) newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg m2 , the number of rotations made by the pulley before its direction of motion if reversed, is

Option 1)

less than 3

Option 2)

more than 3 but less than 6

Option 3)

more than 6 but less than 9

Option 4)

more than 9

Data Administrator

Database professionals use software to store and organise data such as financial information, and customer shipping records. Individuals who opt for a career as data administrators ensure that data is available for users and secured from unauthorised sales. DB administrators may work in various types of industries. It may involve computer systems design, service firms, insurance companies, banks and hospitals.

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Bio Medical Engineer

The field of biomedical engineering opens up a universe of expert chances. An Individual in the biomedical engineering career path work in the field of engineering as well as medicine, in order to find out solutions to common problems of the two fields. The biomedical engineering job opportunities are to collaborate with doctors and researchers to develop medical systems, equipment, or devices that can solve clinical problems. Here we will be discussing jobs after biomedical engineering, how to get a job in biomedical engineering, biomedical engineering scope, and salary. 

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Ethical Hacker

A career as ethical hacker involves various challenges and provides lucrative opportunities in the digital era where every giant business and startup owns its cyberspace on the world wide web. Individuals in the ethical hacker career path try to find the vulnerabilities in the cyber system to get its authority. If he or she succeeds in it then he or she gets its illegal authority. Individuals in the ethical hacker career path then steal information or delete the file that could affect the business, functioning, or services of the organization.

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GIS Expert

GIS officer work on various GIS software to conduct a study and gather spatial and non-spatial information. GIS experts update the GIS data and maintain it. The databases include aerial or satellite imagery, latitudinal and longitudinal coordinates, and manually digitized images of maps. In a career as GIS expert, one is responsible for creating online and mobile maps.

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Data Analyst

The invention of the database has given fresh breath to the people involved in the data analytics career path. Analysis refers to splitting up a whole into its individual components for individual analysis. Data analysis is a method through which raw data are processed and transformed into information that would be beneficial for user strategic thinking.

Data are collected and examined to respond to questions, evaluate hypotheses or contradict theories. It is a tool for analyzing, transforming, modeling, and arranging data with useful knowledge, to assist in decision-making and methods, encompassing various strategies, and is used in different fields of business, research, and social science.

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Individuals who opt for a career as geothermal engineers are the professionals involved in the processing of geothermal energy. The responsibilities of geothermal engineers may vary depending on the workplace location. Those who work in fields design facilities to process and distribute geothermal energy. They oversee the functioning of machinery used in the field.

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Database Architect

If you are intrigued by the programming world and are interested in developing communications networks then a career as database architect may be a good option for you. Data architect roles and responsibilities include building design models for data communication networks. Wide Area Networks (WANs), local area networks (LANs), and intranets are included in the database networks. It is expected that database architects will have in-depth knowledge of a company's business to develop a network to fulfil the requirements of the organisation. Stay tuned as we look at the larger picture and give you more information on what is db architecture, why you should pursue database architecture, what to expect from such a degree and what your job opportunities will be after graduation. Here, we will be discussing how to become a data architect. Students can visit NIT Trichy, IIT Kharagpur, JMI New Delhi

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Remote Sensing Technician

Individuals who opt for a career as a remote sensing technician possess unique personalities. Remote sensing analysts seem to be rational human beings, they are strong, independent, persistent, sincere, realistic and resourceful. Some of them are analytical as well, which means they are intelligent, introspective and inquisitive. 

Remote sensing scientists use remote sensing technology to support scientists in fields such as community planning, flight planning or the management of natural resources. Analysing data collected from aircraft, satellites or ground-based platforms using statistical analysis software, image analysis software or Geographic Information Systems (GIS) is a significant part of their work. Do you want to learn how to become remote sensing technician? There's no need to be concerned; we've devised a simple remote sensing technician career path for you. Scroll through the pages and read.

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Budget Analyst

Budget analysis, in a nutshell, entails thoroughly analyzing the details of a financial budget. The budget analysis aims to better understand and manage revenue. Budget analysts assist in the achievement of financial targets, the preservation of profitability, and the pursuit of long-term growth for a business. Budget analysts generally have a bachelor's degree in accounting, finance, economics, or a closely related field. Knowledge of Financial Management is of prime importance in this career.

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The invention of the database has given fresh breath to the people involved in the data analytics career path. Analysis refers to splitting up a whole into its individual components for individual analysis. Data analysis is a method through which raw data are processed and transformed into information that would be beneficial for user strategic thinking.

Data are collected and examined to respond to questions, evaluate hypotheses or contradict theories. It is a tool for analyzing, transforming, modeling, and arranging data with useful knowledge, to assist in decision-making and methods, encompassing various strategies, and is used in different fields of business, research, and social science.

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Underwriter

An underwriter is a person who assesses and evaluates the risk of insurance in his or her field like mortgage, loan, health policy, investment, and so on and so forth. The underwriter career path does involve risks as analysing the risks means finding out if there is a way for the insurance underwriter jobs to recover the money from its clients. If the risk turns out to be too much for the company then in the future it is an underwriter who will be held accountable for it. Therefore, one must carry out his or her job with a lot of attention and diligence.

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Individuals in the operations manager jobs are responsible for ensuring the efficiency of each department to acquire its optimal goal. They plan the use of resources and distribution of materials. The operations manager's job description includes managing budgets, negotiating contracts, and performing administrative tasks.

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Stock Analyst

Individuals who opt for a career as a stock analyst examine the company's investments makes decisions and keep track of financial securities. The nature of such investments will differ from one business to the next. Individuals in the stock analyst career use data mining to forecast a company's profits and revenues, advise clients on whether to buy or sell, participate in seminars, and discussing financial matters with executives and evaluate annual reports.

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Researcher

A Researcher is a professional who is responsible for collecting data and information by reviewing the literature and conducting experiments and surveys. He or she uses various methodological processes to provide accurate data and information that is utilised by academicians and other industry professionals. Here, we will discuss what is a researcher, the researcher's salary, types of researchers.

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Welding Engineer

Welding Engineer Job Description: A Welding Engineer work involves managing welding projects and supervising welding teams. He or she is responsible for reviewing welding procedures, processes and documentation. A career as Welding Engineer involves conducting failure analyses and causes on welding issues. 

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A career as Transportation Planner requires technical application of science and technology in engineering, particularly the concepts, equipment and technologies involved in the production of products and services. In fields like land use, infrastructure review, ecological standards and street design, he or she considers issues of health, environment and performance. A Transportation Planner assigns resources for implementing and designing programmes. He or she is responsible for assessing needs, preparing plans and forecasts and compliance with regulations.

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Environmental Engineer

Individuals who opt for a career as an environmental engineer are construction professionals who utilise the skills and knowledge of biology, soil science, chemistry and the concept of engineering to design and develop projects that serve as solutions to various environmental problems. 

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Safety Manager

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Conservation Architect

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For an individual who opts for a career as an actor, the primary responsibility is to completely speak to the character he or she is playing and to persuade the crowd that the character is genuine by connecting with them and bringing them into the story. This applies to significant roles and littler parts, as all roles join to make an effective creation. Here in this article, we will discuss how to become an actor in India, actor exams, actor salary in India, and actor jobs. 

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Depending on the video game designer job description and experience they may also have to lead a team and do the early testing of the game in order to suggest changes and find loopholes.

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A career as radio jockey has a lot to offer to deserving candidates. If you want to know more about a career as radio jockey, and how to become a radio jockey then continue reading the article.

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A career as social media manager involves implementing the company’s or brand’s marketing plan across all social media channels. Social media managers help in building or improving a brand’s or a company’s website traffic, build brand awareness, create and implement marketing and brand strategy. Social media managers are key to important social communication as well.

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An individual who is pursuing a career as a producer is responsible for managing the business aspects of production. They are involved in each aspect of production from its inception to deception. Famous movie producers review the script, recommend changes and visualise the story. 

They are responsible for overseeing the finance involved in the project and distributing the film for broadcasting on various platforms. A career as a producer is quite fulfilling as well as exhaustive in terms of playing different roles in order for a production to be successful. Famous movie producers are responsible for hiring creative and technical personnel on contract basis.

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In a career as a copywriter, one has to consult with the client and understand the brief well. A career as a copywriter has a lot to offer to deserving candidates. Several new mediums of advertising are opening therefore making it a lucrative career choice. Students can pursue various copywriter courses such as Journalism, Advertising, Marketing Management. Here, we have discussed how to become a freelance copywriter, copywriter career path, how to become a copywriter in India, and copywriting career outlook. 

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In a career as a vlogger, one generally works for himself or herself. However, once an individual has gained viewership there are several brands and companies that approach them for paid collaboration. It is one of those fields where an individual can earn well while following his or her passion. 

Ever since internet costs got reduced the viewership for these types of content has increased on a large scale. Therefore, a career as a vlogger has a lot to offer. If you want to know more about the Vlogger eligibility, roles and responsibilities then continue reading the article. 

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For publishing books, newspapers, magazines and digital material, editorial and commercial strategies are set by publishers. Individuals in publishing career paths make choices about the markets their businesses will reach and the type of content that their audience will be served. Individuals in book publisher careers collaborate with editorial staff, designers, authors, and freelance contributors who develop and manage the creation of content.

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Careers in journalism are filled with excitement as well as responsibilities. One cannot afford to miss out on the details. As it is the small details that provide insights into a story. Depending on those insights a journalist goes about writing a news article. A journalism career can be stressful at times but if you are someone who is passionate about it then it is the right choice for you. If you want to know more about the media field and journalist career then continue reading this article.

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Individuals in the editor career path is an unsung hero of the news industry who polishes the language of the news stories provided by stringers, reporters, copywriters and content writers and also news agencies. Individuals who opt for a career as an editor make it more persuasive, concise and clear for readers. In this article, we will discuss the details of the editor's career path such as how to become an editor in India, editor salary in India and editor skills and qualities.

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QA Manager
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Quality Controller

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Process Development Engineer

The Process Development Engineers design, implement, manufacture, mine, and other production systems using technical knowledge and expertise in the industry. They use computer modeling software to test technologies and machinery. An individual who is opting career as Process Development Engineer is responsible for developing cost-effective and efficient processes. They also monitor the production process and ensure it functions smoothly and efficiently.

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AWS Solution Architect

An AWS Solution Architect is someone who specializes in developing and implementing cloud computing systems. He or she has a good understanding of the various aspects of cloud computing and can confidently deploy and manage their systems. He or she troubleshoots the issues and evaluates the risk from the third party. 

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Azure Administrator

An Azure Administrator is a professional responsible for implementing, monitoring, and maintaining Azure Solutions. He or she manages cloud infrastructure service instances and various cloud servers as well as sets up public and private cloud systems. 

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Computer Programmer

Careers in computer programming primarily refer to the systematic act of writing code and moreover include wider computer science areas. The word 'programmer' or 'coder' has entered into practice with the growing number of newly self-taught tech enthusiasts. Computer programming careers involve the use of designs created by software developers and engineers and transforming them into commands that can be implemented by computers. These commands result in regular usage of social media sites, word-processing applications and browsers.

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Information Security Manager

Individuals in the information security manager career path involves in overseeing and controlling all aspects of computer security. The IT security manager job description includes planning and carrying out security measures to protect the business data and information from corruption, theft, unauthorised access, and deliberate attack 

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ITSM Manager
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Automation Test Engineer

An Automation Test Engineer job involves executing automated test scripts. He or she identifies the project’s problems and troubleshoots them. The role involves documenting the defect using management tools. He or she works with the application team in order to resolve any issues arising during the testing process. 

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