JEE Main 2003 Chemistry question

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

(1)In acidic solutions protons coordinate with ammonia molecules forming ions and molecules are not availableCorrect
(2)In alkaline solutions insoluble is precipitated which is soluble in excess of any alkali
(3)Copper hydroxide is an amphoteric substance
(4)In acidic solutions hydration protects copper ions.

Answer: (1)

Solution

In acid, the lone pair of is used to accept a proton: . The ammonium ion has no free lone pair to donate to , so the ligand is not available and the complex cannot

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Question ID VK-038200