NCERT Solutions of Acids, Bases and Salts Class 10
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Acid Base and Salt

Exemplar Quesions (NCERT) and Answer

Short Answer Type - I

Exemplar Problem:- 31 - Match the acids given in Column (A) with their correct source given

Exemplar Question 31

Exemplar Problem:- 32. Match the important chemicals given in Column (A) with the chemical formulae given in Column (B)

Exemplar Question 32

Exemplar Problem:- 33. What will be the action of the following substances on litmus paper?

Dry HCl gas, Moistened NH3 gas, Lemon juice, Carbonated soft drink, Curd, Soap solution.

Answer:-

Dry HCl No action

Moistened NH3 gas Turns blue litmus to red

Lemon Juice Turns blue litmus to red

Carbonated soft drink Turns blue litmus to red.

Curd Turns blue litmus to red

Soap solution Turns red litmus to blue.

Explanation:

(a) Dry HCl does not liberate hydrogen ion, hence no action takes place with litmus paper.

(b) NH3 gas forms ammonium hydroxide in with water which turns red litmus paper blue.

(c) Lemon juice is citric acid, so it turns blue litmus paper red.

(d) Carbonate soft drink contains carbon dioxide dissolved in water. Carbon dioxide forms carbonic acid; with water; which turns blue litmus paper red.

(e) Curd contains lactic acid and hence turns blue litmus paper to red.

(f) Soap solution is basic in nature hence it turns red litmus paper to blue.

Exemplar Problem: 34. Name the acid present in ant sting and give its chemical formula. Also give the common method to get relief from the discomfort caused by the ant sting.

Answer:

Name of acid present in ant sting: Methanoic acid

Chemical Formula of methanoic acid: HCOOH

Method to get relief from the discomfort caused by the ant sting: Rubbing baking soda over the location of ant sting.

Explanation: Since baking soda is a base thus by rubbing over the ant sting it neutralizes the methanoic acid present in ant sting and gives relief from pain.

Exemplar Problem:- 35. What happens when nitric acid is added to egg shell?

Answer:-

Egg shell is made of calcium carbonate. We know that when calcium carbonate reacts with nitric acid, it gives carbon dioxide, calcium nitrate and water. Same reaction happens when nitric acid is poured over egg shell.

Exemplar Question 35
        
  NCERT Solutions of Acids, Bases and Salts Class 10
<< Exemplar Problem and Solution (NCERT) : MCQs 3Exemplar Quesions (NCERT) : Short Answer - II >>

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