1(ii)
A compound P is heated in a test tube with sodium hydroxide solution. A red litmus paper held at the mouth of the test tube turns blue. Which of the following could compound P be?
- (a)Zinc sulphate
- (b)Copper sulphate
- (c)Ferrous sulphate
- (d)Ammonium sulphate
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Ammonium sulphate
Reason — Ammonium sulphate reacts with sodium hydroxide to produce sodium sulphate, ammonia gas, and water. The red litmus turns blue due to the basic ammonia gas.