Question

Statement-1 : Ammonia forms the complex $\left[Cu\right(N{H}_3{)}_4{]}^{2+}$ with copper ions in alkaline solution but not in acidic solution.
Statement-2 : In acidic solution protons are coordinated with ammonia molecules forming $N{H}_4^{+}$ ions.

• A. Both Statement -1 and Statement - 2 are true and reason is the correct explanation of Statement -1
• B. Both Statement -1 and Statement - 2 are true but Statement -2 is not the correct explanation of Statement-1
• C. Statement - 1 is true but Statement-1 is false
• D. Statement -1 is false but Statement-2 is true

Answer 1

The correct option is A Both Statement -1 and Statement - 2 are true and reason is the correct explanation of Statement -1

$C{u}^{2+}\left(aq\right)+4N{H}_3\stackrel{H^{+}}{\rightleftharpoons }C{u}^{2+}+4N{H}_4^{+}$ (No complex formation).
As $N{H}_3$ combines with $H^{+}$ of acid and changes to $N{H}_4^{+}$ which have no donor site.