question_answer

Ammonia forms the complex \[Cu{{(N{{H}_{4}})}_{4}}^{2+}\] with copper ion in alkaline solution, but not in acidic solution. This is because of which of the following?

A) In alkaline solution, insoluble \[Cu{{(OH)}_{2}}\] is precipitated, which is soluble in excess of any alkali

B) \[Cu{{(OH)}_{2}}\] is amphoteric.

C) In an acidic solution, hydration protects \[C{{u}^{2+}}\] ion.

D) In acidic solution, proton coordinates with \[N{{H}_{3}}\] forming \[N{{H}_{4}}^{+}\] is not available.