Ammonia forms the complex `[Cu(NH_3)_4]^(2+)` with copper ions in alkaline solution but not in acid solution. The reasons for it is:

Options

A. In acidic solutions hydration protects copper ions
B. In acidic solutions protons coordinate with ammonia molecules forming `NH_4^(+)` ions and `NH_3` molecules are not available
C. In alkaline solutions insoluble `Cu(OH)_2` is precipitated which is soluble in excess of any alkali
D. Copper hydroxide is an amphoteric substance

Answer

B

Explanation

Properties of ionic solid