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. The reaction is:
(NH4)2SO4 + 2NaOH ⟶ 2NH3(g) + Na2SO4 +2H2O