AIEEE 2003 Chemistry Solved Paper

Section: Chemistry

Question : 58 of 76

Marks: +1, -0

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

[AIEEE 2003]

In acidic solutions protons coordinate 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
In acidic solutions hydration protects copper ions.

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