NCERT Solutions for Class 10 Science Chapter 2 Acids, Bases, and Salts: In every student's life, class 10 is a very important stage. The result of your class 10 board exam will give you the right direction towards your career. As per the previous year's paper analysis, there is a higher probability of 3 marks or 5 marks questions appearing in the exam from chapter 2 Acid, Bases and Salts. If you want to score well in your board exams then NCERT solutions for class 10 science chapter 2 Acids, Bases and Salts will give you proper knowledge of the concepts, equations, and formulas. In this article, you will get NCERT solutions for class 10 science chapter 2 acids, bases, and salts. With the help of NCERT solutions , you can easily solve questions. If you want to score well in other subjects, you are advised to go through the NCERT solutions . Students are advised to go through NCERT solutions for class 10 to score good marks in Board examination.
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What you are going to learn in NCERT solutions for class 10 science chapter 2 Acids, Bases, and Salts?
- In Chapter 2 Acids, Bases and Salts, you will also study when an acid reacts with a metal, hydrogen gas is evolved and a corresponding salt is formed.
- Through this chapter, you will get to know that the strength of an acid or an alkali can be tested by using a scale called the pH scale (0-14).
- A salt is formed when a base reacts with metal, along with the evolution of hydrogen gas which has a negative ion composed of the metal and oxygen.
- When an acid reacts with a metal hydrogen carbonate or metal carbonate, it gives the corresponding salt, water, and carbon dioxide gas .
- Electricity in water is conducted by Acidic and basic solutions because they produce hydrogen and hydroxide ions respectively.
- in everyday life and in industries, salts have various uses.
CBSE NCERT solutions for class 10 science chapter 2 Acids, Bases, and Salts
NCERT solutions for class 10 science chapter 2 Acids, Bases and Salts
Topic 2.1 - Understanding the chemical properties of acids and bases
Q.1 Why should curd and sour substances not be kept in brass and copper vessels?
Curd and sour substances not be kept in brass and copper vessels because curd and other sour substances contain acids.
Therefore, when they are kept in brass and copper vessels, the metal reacts with the acid to liberate hydrogen gas and harmful products, thereby may spoil the food.
Q.3 Why does dry HCl gas not change the colour of the dry litmus paper?
The colour of litmus paper changes only in the presence of ions like hydrogen ( ) or hydronium ( ) ions. Dry HCl does not contain ( ) or ( ) ions. It can produce these ions only in the form of an aqueous solution.
Hence, because of that dry HCl gas does not change the colour of dry litmus paper.
The concentration of hydroxide ions would increase when excess base is dissolved in a solution of sodium hydroxide .
Q.6 Compounds such as alcohol and glucose also contain hydrogen but are not categorized as acids. Describe an activity to prove it.
Take the solution of dilute hydrochloric solution and glucose. Two nails are fitted on a cork and are kept it in a 100 mL beaker. The nails are then connected to the two terminals of a 6-volt battery through a bulb and a switch. Dilute HCl is poured in the beaker and current is switched on. Now, the same experiment is performed with a glucose solution and an alcohol solution.
We will observe that the bulb glows in the HCl solution and does not glow in the glucose solution.
Because: HCl dissociate into H + (aq) and Cl -(aq) ions. These ions conduct electricity in the solution resulting in the glowing of the bulb. On the other hand, the glucose solution does not dissociate into ions. Therefore, it does not conduct electricity.
From this activity, it can be concluded that all acids contain hydrogen but not all compounds containing hydrogen are acids. That is why, though compounds like alcohols and glucose contain hydrogen, they are not categorized as acids.
Q.8 Why do acids not show acidic behavior in the absence of water?
Acids do not show acidic behavior in the absence of water because acids form hydrogen ions [H + (aq) ions] in its aqueous solution which are responsible for their acidic characters and the dissociation of hydrogen ions from an acid occurs in the presence of water only.
Therefore in the absence of water, acids do not produce hydrogen ions and hence do not show acidic behavior.
Q.9 (a) Five solutions A, B, C, D, and E, when tested with universal indicator, showed pH as 4,1,11,7 and 9, respectively. Which solution is
Solution with pH equal to 7 is a neutral solution. Therefore, a neutral solution is D
Q.9(b) Five solutions A, B, C, D, and E, when tested with universal indicator, showed pH as 4,1,11,7 and 9, respectively. Which solution is
The solution with the highest pH is strongly alkaline. Therefore, a strongly alkaline solution is C with a pH equal to 11
Q.9(c) Five solutions A, B, C, D, and E, when tested with universal indicator, showed pH as 4,1,11,7 and 9, respectively. Which solution is
The solution with the lowest pH value is strongly acidic. Therefore, a strongly acidic solution is B with pH equal to 1
Q.9(d) Five solutions A, B, C, D, and E, when tested with universal indicator, showed pH as 4,1,11,7 and 9, respectively. Which solution is
Solution with pH less than 7 but close to 7 is weakly acidic. Therefore, the weakly acidic solution is A with a pH equal to 4
Q.9(e) Five solutions A, B, C, D, and E, when tested with universal indicator, showed pH as 4,1,11,7 and 9, respectively. Which solution is
e) Weakly alkaline?
The solution with a pH greater than 7 but close to 7 is weakly alkaline. Therefore, a weakly alkaline solution is E with pH equal to 9
Q.14 What is a neutralization reaction? Give two examples.
A reaction in which an acid and base react with each other to give a salt and water is known as neutralization reaction. That is:
(i) Sodium hydroxide (NaOH) reacts with hydrochloric acid (HCl) to form sodium chloride (NaCl) and water:
(ii) Magnesium hydroxide reacts with hydrochloric acid to form magnesium chloride and water:
Q.15 Give two important uses of washing soda and baking soda.
Uses of Washing Soda:
(i) It is used for removing the permanent hardness of the water.
(ii) It is used in glass, soap, and paper industries.
Uses of Baking Soda:
(i) It is used in soda-acid fire extinguishers.
(ii) It is used in making baking powder. Baking powder is a mixture of baking soda and a mild edible acid called tartaric acid. When baking powder is heated or mixed in water, it releases that makes cakes or bread fluffy.
NCERT Solutions for Class 10 Science - Chapter wise
Benefits of NCERT solutions for class 10 science chapter 2 Acids, Bases, and Salts
- You can use these NCERT solutions like a time savior, here you will get solutions for all the exercises and extra questions related to this chapter.
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