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Ammonia forms the complex ion[Cu(NH₃)₄]²⁺ with copper ions in alkaline solutions but not in acidic solutions. The reason is

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Copper hydroxide is an amphoteric substance.

In acidic solutions hydration protects copper ions

In alkaline solutions insoluble Cu(OH)₂ is precipitated which is soluble in excess of any alkali

In acidic solutions protons coordinate with ammonia molecules forming ${NH}_{4}^{+}$ ions and NH₃ molecules are not available

answer is B.

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Detailed Solution

Ammonia is a base. In acidic medium, it reacts with protons to form ammonium ions. Thus free ammonia molecules are not present. So they cannot coordinate with Cu(II) ion to form the [Cu(NH₃)₄]²⁺ complex ion.

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