Question

Q99 For complex ion, [Cu(NH3)4]2+,
which of the following statements are
true?
(i) Stability constant is the inverse of
instability constant
(ii) Stability constant is
[Cu(NH3)4]2+
[Cu2+][NH3]4
(ii) Greater the stability constant,
stronger is the Copper Ammonia bond
Ops: A.
Only (1)
B.
Only (ii)
C.
Both (i) and (ii)
D.
All (i), (ii) and (iii)
Mark for review​

Answer 1

It does not form a complex with copper ion.

Explanation:

In acidic solutions, ammonia reacts with proton and forms ammonium ion which further cannot act as a lig-and. Also, no free ammonia molecules are available for co-ordination. Hence, it does not form a complex with copper ion.

The reaction is as follows:

NH3​ + H+ → NH4+​