Ammonia forms the complex ion [Cu(NH3)4]2+ with copper ions…

Chemistry D and F - Block Elements General Single Correct MCQ

Published on: August 13, 2026

Ammonia forms the complex ion [Cu(NH3)4]2+ with copper ions in the alkaline solutions but not in acidic solutions. What is the Statement-2 for it ?

In acidic solutions hydration protects copper ions

In acidic solutions protons co-ordinate with ammonia molecules forming NH4+ ions and NH3 molecules are not available.

In alkaline solutions insoluble Cu(OH)2 is precipitated which is soluble in excess of any alkali

Copper hydroxide is an amphoteric substance.

Text Solution

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The correct answer is:

The pair of electrons present with nitrogen will not be available to be donated as H+ will consume that one.

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