Q50 of 270 Page 68

How is the neutralization of a carbonate with an acid different from the neutralization of an oxide or a hydroxide?

Neutralization of carbonate with acid will lead to formation of salt, water and evolution of carbon-di-oxide gas. However, neutralization of oxide or hydroxide with acid will lead to formation of salt and water only.

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48 You have been provided with three test-tubes. One of these test-tubes contains distilled water and the other two contain an acidic and a basic solution respectively. If you are given only blue litmus paper, how will you identify the contents of each test- tube? 49 A substance X which is used as an antacid reacts with dilute hydrochloric acid to produce a gas Y which is used in one type of fire-extinguisher. Name the substance X and gas Y. Write a balanced equation for the chemical reaction which takes place. 51 What happens to

(a) the H+ ions, and


(b) temperature of the solution, when an acid is neutralized?

 1 Name the gas evolved when zinc granules are treated/heated with:

(a) hydrochloric acid solution


(b) sodiumhydroxide solution