NEET Chemistry Functional Group Tests MCQ Question
Which combination of statements correctly describes the functional group tests for copper ion (Cu 2+)?
Copper sulphide dissolves in nitric acid, forming a blue solution due to copper nitrate. Basic copper sulphate precipitates with ammonium hydroxide.
The blue solution turns purple when acidified with acetic acid. Tetraamminecopper(II) complex is formed in the presence of ammonium hydroxide.
Copper ions produce a yellow precipitate with potassium nitrite after treatment with aqua regia. The precipitate is identified as potassium hexanitritocobaltate(III).
Copper sulphide reacts with hydrochloric acid to form copper chloride, which precipitates as copper hydroxide when treated with ammonia.
Correct Answer
Detailed Explanation
Copper sulphide dissolves in nitric acid to yield copper nitrate, which gives a blue solution due to the formation of copper(II) ions. Ammonium hydroxide leads to the precipitation of basic copper sulphate, confirming the presence of Cu 2+ ions.
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