Ammonia forms the complex `[Cu(NH_(3))_(4)]^(2+)` will copper ions in alkaline solution but not in acidic solution. The reason for this is

Options

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 `Cu^(2+)` ions.
D. in acidic solution protons coordinates with ammonia molecules forming `NH_(4)^(+)` ions and `NH_(3)` molecules are not available.

Answer

D