Home Chemistry Co-ordinatios Compounds General Ammonia forms the complex [Cu(NH3)4]2+ with …
Chemistry Co-ordinatios Compounds General Single Correct MCQ
Published on: August 12, 2026

Ammonia forms the complex [Cu(NH3)4]2+ with copper ions in alkaline solution but not in acid solution. The reason for it is :

A
In alkaline solution Cu(OH)2 is precipitated which is soluble in excess of alkali.
B
Copper hydroxide is amphoteric.
C
In acidic solution hydration protects Cu2+ ions.
D
In acidic solution protons coordinates with ammonia molecule forming NH4+ ions and NH3 molecules are not available.

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Text Solution

Verified by Experts
The correct answer is:
D

In acidic solution, N atoms of donates their lone pair electrons to protons forming ions.

Therefore, lone pair electrons of are not available for forming the complex with copper ions.

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