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Ammonia forms the complex [Cu(NH3)4]^(2+...

Ammonia forms the complex `[Cu(NH_3)_4]^(2+)` with copper ions in alkaline solution but not in acid solution. The reasons for it is:

A

In acidic solution hydration protects copper ions

B

In alkaline solution insoluble `Cu(OH)_(2) is precipitated with excess of an alkali

C

Copper hydroxide is an amphoteric substance

D

In acidic solution protons coordinate with ammonia molecules are not variable.

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