JEE Main Chemistry question

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

(A)In acidic solutions, hydration protects copper ions
(B)In acidic solutions, protons coordinate with ammonia molecules forming ions, and molecules are not availableCorrect
(C)In alkaline solution, insoluble is precipitated, which dissolves in excess of any alkali
(D)Copper hydroxide is an amphoteric substance

Answer: (B)

Solution

must retain its lone pair to act as a ligand. In acidic solution it is protonated to ,

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Question ID VK-155449