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NCERT Solutions for Class 10 Science Chapter 1 Chemical Reactions and Equations: The solutions for class 10 science chapter 1 is a part of NCERT solutions for class 10 science. Here are the all NCERT Solutions for Class 10 Science Chapter 1 Chemical Reactions and Equations. Students appearing in the board exams must go through the Class 10 Science Chapter 1 NCERT solutions. Chemical Reactions and Equations is one of the most important chapters in the NCERT Books for Class 10 Science. All the questions with detailed explanations are provided in the Chemical Reactions and Equations Class 10 Solutions. NCERT Solutions for Class 10 Science "chemical reaction and equation" will help you in board exam preparation as well as competitive exam preparation. Go through the questions and answers given in NCERT Solutions for Class 10 Science Chapter 1.
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Suggested: NCERT Class 10 Science: Chapterwise Important Formulas, Diagrams, and Points
Chemistry class 10 chapter 1 Science mainly deals with writing chemical equations and balancing chemical equations. The Chapter-wise NCERT Solutions for Class 10 science have been updated as per the latest CBSE Science class 10 syllabus and guidelines. In order for students to achieve the highest possible marks on the CBSE exams, the language used in chapter 1 science class 10 Solutions is simple to understand. Also, in class 10 science chapter 1 question answer students gain a basic understanding of chemical processes, including their types and the effects of chemical oxidation in daily life.
Q 1 . Why should a magnesium ribbon be cleaned before burning in air?
Answer:
Magnesium is a very reactive metal so it reacts with oxygen to form a layer of magnesium oxide on its surface.
This layer is stable oxide so prevent further reaction of magnesium with oxygen. To remove this layer a magnesium ribbon is cleaned using sandpaper before burning in air.
Q 2. (i) Write the balanced equation for the following chemical reactions.
Hydrogen + Chlorine → Hydrogen chloride
Answer :
The balanced equation for the following chemical reactions is given as :
Q 2. (ii) Write the balanced equation for the following chemical reactions.
Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride
Answer:
The balanced equation for the following chemical reactions is given as :
Q2. (iii) Write the balanced equation for the following chemical reactions.
Sodium + Water → Sodium hydroxide + Hydrogen
Answer:
The balanced equation for the following chemical reactions is given as :
Q 3. (i) Write a balanced chemical equation with state symbols for the following reactions.
Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride.
Answer:
The reaction of solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride is given by :
Q 3. (ii) Write a balanced chemical equation with state symbols for the following reactions.
Sodium hydroxide solution (in water) reacts with a hydrochloric acid solution (in water) to produce sodium chloride solution and water.
Answer:
The reaction of sodium hydroxide solution (in water) reacts with a hydrochloric acid solution (in water) to produce sodium chloride solution and water is given by :
Q 1. (i) A solution of a substance is used for whitewashing.
Name the substance ‘X’ and write its formula
Answer:
The substance ‘X’ is calcium oxide and its formula is CaO.
Q 1.(ii) A solution of a substance is used for whitewashing.
Write the reaction of the substance named in (i) above with water
Answer:
The reaction of calcium oxide with water is given by :
Answer :
Water contains one part oxygen and two parts hydrogen. During electrolysis, oxygen and hydrogen are produced in a 1:2 ratio. In electrolysis oxygen goes in one test tube and hydrogen in a second test tube, so the amount of gas collected in the second test tube is double of first one.
NCERT Textbook Solutions for Class 10th Science Chapter 1 Chemical Reaction and Equation
Topic 1.3 Have you observed the effects of an oxidation reaction in everyday life?
Q 1. Why does the colour of copper sulphate solution change when an iron nail is dipped in it?
Answer:
The color of copper sulphate solution change when an iron nail is dipped in it because iron displaces copper from copper sulphate forming iron sulphate,which is green.
The colour change from blue to green.
Q 2. Give an example of a double displacement reaction other than the one given in Activity.
Answer:
An example of a double displacement reaction other than the one given in Activity is :
Answer:
In the above reaction, Na is oxidised and oxygen gets reduced.
Answer:
In the above reaction, CuO is reduced to form Cu and hydrogen gets oxidized to water.
Q 1. Which of the statements about the reaction below are incorrect?
(a) Lead is getting reduced.
(b) Carbon dioxide is getting oxidized.
(c) Carbon is getting oxidized.
(d) Lead oxide is getting reduced.
(i) (a) and (b)
(ii) (a) and (c)
(iii) (a), (b) and (c)
(iv) all
Answer:
In the above reaction, PbO reduces to Pb and C(carbon) gets oxidized to carbon dioxide.
Hence, statements (a) and (b) are correct.
Thus, option (i) is correct.
Q 2. The above reaction is an example of a
(a) combination reaction.
(b) double displacement reaction.
(c) decomposition reaction.
(d) displacement reaction
Answer :
The above reaction is an example of a displacement reaction.
Hence, option (d) is correct.
Q 3. What happens when dilute hydrochloric acid is added to iron filings? Tick the correct answer.
(a) Hydrogen gas and iron chloride are produced.
(b) Chlorine gas and iron hydroxide are produced.
(c) No reaction takes place.
(d) Iron salt and water are produced.
Answer:
When dilute hydrochloric acid is added to iron fillings then hydrogen gas and iron chloride are produced.
The reaction is given as :
Thus, option (a) is correct.
Q 4. What is a balanced chemical equation? Why should chemical equations be balanced?
Answer:
The chemical equation which has an equal number of atoms of all elements on both sides of the reaction is known as a balanced chemical equation.
The law of conservation of mass states that mass can neither be created nor be destroyed so chemical equations should be balanced.
Q 5. (a) Translate the following statements into chemical equations and then balance them.
Hydrogen gas combines with nitrogen to form ammonia.
Answer:
Hydrogen gas combines with nitrogen to form ammonia can be written as :
Q 5 (b) Hydrogen sulphide gas burns in air to give water and sulfur dioxide.
Answer:
Hydrogen sulphide gas burns in air to give water and sulfur dioxide can be written as :
Answer:
Barium chloride reacts with aluminum sulphate to give aluminum chloride and a precipitate of barium sulphate can be written as :
Q 5. (d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
Answer:
Potassium metal reacts with water to give potassium hydroxide and hydrogen gas is given by :
Q 6. (a) Balance the following chemical equations.
Balance the following chemical equations. (a)
Answer:
The balanced chemical equation is given as :
Q 6. (b) Balance the following chemical equations.
Answer:
The balanced chemical equation is given as :
Q 6. (c) Balance the following chemical equations.
Answer:
The balanced chemical equation is given as :
Q 6. (d) Balance the following chemical equations.
Answer:
A balanced chemical equation is given as :
Q 7. (a) Write the balanced chemical equations for the following reactions.
(a) Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water
Answer:
Calcium hydroxide + Carbon dioxide →Calcium carbonate + Water
The balanced chemical equations for the above reaction is given as :
Q 7. (b) Zinc + Silver nitrate → Zinc nitrate + Silver
Answer:
Zinc + Silver nitrate → Zinc nitrate + Silver
The balanced chemical equation for the above reaction is given as :
Q 7. (c) Aluminium + Copper chloride → Aluminium chloride + Copper
Answer:
Aluminium + Copper chloride → Aluminium chloride + Copper
The balanced chemical equation for the above reaction is given as :
Q 7. (d) Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride
Answer:
Barium chloride + Potassium sulphate → Barium sulphate + Potassium chloride
The balanced chemical equation for the above reaction is given as :
(a) Potassium bromide(aq) + Barium iodide(aq) → Potassium iodide(aq) + Barium bromide(s)
Answer:
Potassium bromide(aq) + Barium iodide(aq) → Potassium iodide(aq) + Barium bromide(s)
The balanced chemical equation for the above reaction is given as :
It is a double displacement reaction.
Q 8. (b) Zinc carbonate(s) → Zinc oxide(s) + Carbon dioxide(g)
Answer:
Zinc carbonate(s) → Zinc oxide(s) + Carbon dioxide(g)
The balanced chemical equation for the above reaction is given by :
It is decomposition reaction.
Q 8. (c) Hydrogen(g) + Chlorine(g) → Hydrogen chloride(g)
Answer:
Hydrogen(g) + Chlorine(g) → Hydrogen chloride(g)
The balanced chemical equation for the above reaction is given by :
It is combination reaction.
Q 8. (d) Magnesium(s) + Hydrochloric acid(aq) → Magnesium chloride(aq) + Hydrogen(g)
Answer:
Magnesium(s) + Hydrochloric acid(aq) → Magnesium chloride(aq) + Hydrogen(g)
The balanced chemical equation for the above reaction is given by :
It is displacement reaction.
Q 9. What does one mean by exothermic and endothermic reactions? Give examples.
Answer:
Exothermic reactions: Reactions in which heat is given out along with the products are called exothermic reactions.
Example :
Endothermic reactions: Reactions in which energy is absorbed are known as endothermic reactions.
Example: The process of photosynthesis.
Q 10. Why is respiration considered an exothermic reaction? Explain .
Answer:
We know that energy is required to support life. We get energy from the food we eat.
The large molecules of food are broken into a simpler substance like glucose during digestion.
Glucose and oxygen react to provide energy to the body. This reaction is a combination reaction named as respiration. In this whole process, energy is released so respiration is considered an exothermic reaction.
Answer:
In decomposition reactions, we can observe that a single reactant breaks down to give simpler products. This reaction source of energy. Whereas, in combination reaction two or more substances combine to give a product and energy is released in this reaction.
Hence, decomposition reactions called the opposite of combination reactions.
Example :
decomposition reaction :
and the combination reaction :
Answer:
The decomposition reaction by heat:
The decomposition reaction by light :
The decomposition reaction by electricity :
Answer:
When an element displaces another element from its compound, a displacement reaction occurs.
Example :
Two different atoms or groups of atoms (ions) are exchanged in a double displacement reaction.
Example :
Answer:
In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. The reaction involved can be written as :
Q 15. What do you mean by a precipitation reaction? Explain by giving examples.
Answer:
Any reaction that produces a precipitate is called a precipitation reaction.
Example :
Here, we have as precipitate so it is a precipitation reaction.
Q 16.
(a)
Explain the following in terms of gain or loss of oxygen with two examples each. (a) Oxidation
Oxidation is a reaction in which the gain of oxygen or loss of hydrogen can be observed.
Example :
Q 16. (b) Reduction
Answer:
The reaction in which the loss of oxygen or gain of hydrogen can be observed is known as reduction reaction.
Example :
Answer:
A shiny brown colored element is copper (Cu) and on heating, in the air it becomes black in colour because of the formation of copper oxide(CuO).
Q 18. Why do we apply paint on iron articles?
Answer:
To prevent iron from rusting paint is applied to iron articles. After applying paint iron articles are not in contact with moisture and air and hence rusting is prevented.
Q 19. Oil and fat containing food items are flushed with nitrogen. Why?
Answer:
We know that nitrogen is an inert gas and does not react with the oil and fat-containing food. Whereas, other gases like oxygen react with the oil and fat-containing food and make them rancid. Hence, to remove oxygen and prevent food from acidity food items are flushed with nitrogen.
Q 20.(a) Explain the following terms with one example each.
Corrosion
Answer:
Corrosion is a process in which metals deteriorate due to chemical reaction with moisture, air, and chemicals. Rusting of iron is a major example of corrosion. Iron corrodes in the presence of moisture and air.
Q 20. (b) Rancidity
Answer:
(b) Rancidity
The process of oxidation of fats and oils which can be noticed by a change in color, smell, and taste is known as rancidity.
Example: When butter is kept in the open atmosphere than its smell and taste change which results in rancidity.
Chapter No. | Chapter Name |
Chapter 1 | Chemical Reactions and Equations |
Chapter 2 | |
Chapter 3 | |
Chapter 4 | |
Chapter 5 | |
Chapter 6 | |
Chapter 7 | |
Chapter 8 | |
Chapter 9 | |
Chapter 10 | |
Chapter 11 | |
Chapter 12 | |
Chapter 13 | |
Chapter 14 | |
Chapter 15 | |
Chapter 16 |
Important Formulas from Chapter 1 Science Class 10 are listed below. Go through them to make your basic concept more concrete.
TYPES OF CHEMICAL REACTIONS
Combination or Addition reaction: A + B → AB
Decomposition Reaction: AB → A + B
Displacement Reaction: A + BC → AC + B
Double Displacement Reaction or Precipitation Reaction:
AgNO3 + NaCl → AgCl(s) + NaNO3
Oxidation and Reduction reactions:
For more, Download the - NCERT Class 10 Science: Chapterwise Important Formulas, Diagrams, And Points
Also Read
Important topics and subtopics from Science Class 10 Chapter 1 are given below:
The NCERT Solutions for Class 10 Science Chapter 1 have good weightage, and there will be around four questions asked from this chapter every year. The types of questions that appear in chemical reaction and equation class 10 are mostly practice-based questions. Thorough knowledge and good practice will help learners score full marks on the questions asked in this chapter. Science Class 10 Chapter 1 NCERT Solutions are easy to access and download.
The highlights for the Class 10 Science Chapter 1 solution PDF are given below:
Firstly go through the Science Chapter 1 Class 10 and learn all the concepts. Afterwards, move to the NCERT Class 10 Science Solutions Chapter 1.
Practice all the diagrams, equations and definitions regularly to have a strong understanding of the Chapter 1 Science Class 10.
To check your preparation level, you can check previous year question papers from the Class 10 board exams and check if you are able to solve all the questions with the help of NCERT solutions.
If you have any questions that you are not able to find in the NCERT solutions for Class 10 Science Chapter 1, Well, go ahead and ask your question in the discuss doubts section. The experts will explain to you the solutions.
NCERT Solutions for Class 10 for other subjects
Chemical equations
Writing a chemical equation
Balanced chemical equations
Types of chemical reactions
Effects of oxidation reactions in everyday life
NCERT Solutions for Class 10 Science Chapter 1 PDF Download is not available right now. But you can save the webpage to get the solutions offline.
Weightage of chapter Chemical Reactions and Equations in CBSE class 10 board final exam is around 5 marks. To solve questions refer to NCERT book and NCERT exemplar. Also refer to CBSE previous year papers of Class 10 CBSE board.
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