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Ammonia forms the complex [Cu(NH(3))(4)]...

Ammonia forms the complex `[Cu(NH_(3))_(4)]^(2+)` with copper ion in alkaline solution but not in acidic solution. This is due to the reason that :

A

In acidic solution , protons coordinate with ammonia molecules forming `NH_4^+` ions and `NH_3` molecules are not available

B

In alkaline solutions insoluble `Cu(OH)_2` is precipitated which is soluble in excess of any alkali

C

Copper hydroxide is an amphoteric substance

D

In acidic solutions hydration protects copper ions

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The correct Answer is:
A
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