Exemplar Problem:- 31 - Match the acids given in Column (A) with their correct source given
Exemplar Problem:- 32. Match the important chemicals given in Column (A) with the chemical formulae given in Column (B)
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.
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.
(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.
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?
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.
Acid Base and Salt will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.