When ammonium hydroxide is added to solution B, a pale blue precipitate is formed . This pale blue precipitate dissolves in excess of ammonium hydroxide giving an inky blue solution. Name the cation present in solution B.

Cu²⁺

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Fe²⁺

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Fe³⁺

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Zn²⁺

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Solution

The correct option is A
Cu²⁺

When copper sulphate reacts with ammonium hydroxide, ammonium sulphate and a pale blue precipitate of copper hydroxide is formed.

$C u S O_{4} + 2 N H_{4} O H \to (N H_{4})_{2} S O_{4} + C u (O H)_{2} ↓$

The pale blue precipitate of copper hydroxide dissolves in excess of ammonium hydroxide forming tetraamine copper[II] sulphate, an azure blue (deep blue) soluble complex salt.

$C u {(O H)}_{2} + {(N H_{4})}_{2} S O_{4} + 2 N H_{4} O H \to [C u (N H_{3})_{4}] S O_{4} + 4 H_{2} O$

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Similar questions

A, B, C

A

B

{N H}_{4} O H

C

{N H}_{4} O H

Chemical test	Observation	Conclusion
To solution X, ammonium hydroxide is added in minimum quantity first and then in excess.	A dirty white precipitate is formed which dissolves in excess to form a clear solution.
To solution Y ammonium hydroxide is added in minimum quantity first and then in excess.	A pale blue precipitate is formed which dissolves in excess to form a clear inky blue solution.
To solution W a small quantity of sodium hydroxide solution hydroxide solution is added and then in excess.	A white precipitate is formed which remains insoluble.
To a salt Z calcium hydroxide solution is added and then heated.	A pungent smelling gas turning moist red litmus paper blue is obtained.

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