What would you observe in each of the following cases (5) 1. Ammonium hydroxide is first added in a small quantity and then in excess to a solution of copper sulphate . 2. Sodium hydroxide is added with ammonium sulphate . 3. Sulphur is oxidized by concentrated nitric acid. 4. Zinc reacts with hydrochloric acid . 5. Ammonium hydroxide is first added in a small quantity and then excess to solution of calcium nitrate.
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This amine complex of copper is a deep blue colour complex. The reaction proceeds with the formation of a pale blue coloured precipitate when treated with the excess of ammonium hydroxide the deep blue coloured solution is formed. Hence (A) is the correct option.
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