Ammonia forms the complexion `[Cu(NH_3)_4]^(2+)` with copper ions in alkaline solutions but not in acidic solutions. What is the reason for it?

Options

A. In acidic solutions protons coordinate with ammonia molecules forming `NH_(4)^(+)` ions and `NH_3` molecules are not available
B. In alkaline solutions in soluble `Cu(OH)_2` is precipitated which is soluble in excess of any alkali
C. Copper hydroxide is an amplioteric substance
D. In acidic solutions hydration protects copper ions

Answer

A

Explanation

`overset(* * )(NH_3) + H^(+) (" acid medium ") hArr overset(+)(NH_4)`