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. (a) in alkaline solution `Cu(OH)_2` is precipitated which is soluble in excess of alkali
B. (b) in acidic solution protons coordinates with ammonia molecule forming `NH_4^(+)` ions and `NH_3` molecules are not available.
C. (c) copper hydroxide is amphoteric
D. (d) in acidic solution hydration protects `Cu^(2+)` ions

Answer

B

Explanation

It is a reason for given fact.