Question

\[CuS{O_4}\] reacts with $N{H_4}OH$ to give deep blue complex of:
A.Copper Ammonium sulphate
B.Copper Ammonium hydroxide
C.Both A and B
D.None of these

Answer 1

Hint: At first think about the product formed on reaction of copper sulphate with ammonium hydroxide. With addition of an excess amount of ammonium hydroxide to copper sulphate solution gives a deep blue solution .

Complete step by step answer:
The reaction of copper sulphate solution with ammonium hydroxide is given by,
$CuS{O_4} + 4N{H_4}OH \to [Cu{(N{H_3})_4}]S{O_4} + 4{H_2}O$
From the above reaction we can conclude that the deep blue complex formed is $[Cu{(N{H_3})_4}]S{O_4}$. The name of the above compound is copper ammonium sulphate.
So the answer is A.

Additional Information:-The IUPAC name of the compound $[Cu{(N{H_3})_4}]S{O_4}$ is tetraamminecopper$(II)$sulphate. The other names of copper sulphate are blue vitriol, cupric sulphate, bluestone etc. Copper sulphate is produced industrially by treating copper metal with hot concentrated sulphuric acid or its oxides with dilute sulphuric acid. Copper pentahydrate decomposes before melting. It is used as a fungicide. Bordeaux mixture, a suspension of copper sulphate and calcium hydroxide is used to control fungus on grapes, melons and other berries. It is produced by mixing a water solution of copper sulphate and a suspension of slaked lime. Copper ions are highly toxic to fish. A dilute solution of copper sulphate is used to treat aquarium fishes for parasitic infections and is also used to remove snails from aquariums.

Note:
The general name of the deep blue complex is copper ammonium sulphate. General name or common name is not related to the IUPAC name of the given compound. The IUPAC name of the compound $[Cu{(N{H_3})_4}]S{O_4}$ is tetraamminecopper$(II)$sulphate.