Q. Ammonia forms the complex ion with copper ions in the alkaline solutions but not in acidic solutions. What is the reason for it?

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A

In acidic solutions, protons coordinate with ammonia molecules forming ions and molecules are not available

B

In alkaline solutions insoluble 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

Solution:

Ammonia forms the complex ion with copper ions in the alkaline solutions but not in acidic solutions as in acidic solutions, forms a bond with to give ion which does not have a lone pair on N to act as a ligand.

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