JEE Main Chemistry question

Ammonia forms the complex ion with copper ions in alkaline solutions but not in acidic solutions. What is the reason for it? **[MP PET 2007]**

(A)In acidic solutions, hydration protects copper ions
(B)In acidic solutions, protons coordinate with ammonia molecules forming ions, so molecules are not available to act as ligandCorrect
(C)Precipitated , which is soluble in excess of any alkali
(D)Copper hydroxide is an amphoteric substance

Answer: (B)

Solution

is a Lewis base and ligand only while it retains its lone pair. In acidic solution, is protonated to , which has no lone pair

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Question ID VK-155394