Question

The complex K4[Zn(CN)4(O2)2] is oxidised into K2[Zn(CN)4(O2)2] , then which of the following is correct ?

• A. Zn (II) is oxidised into Zn (IV)
• B. Paramagnetic moment decreases
• C. O – O bond length increases
• D. Paramagnetic moment increases

Answer 1

Answer: (D)

Paramagnetic moment increases

Answer 2

K4[ZnII(CN)4(O2)2]4– $\xrightarrow { \text { oxidised } }$ K2[ZnII(CN)4(O2)2]2–

O2– (has 1unpaired electron in antibonding MO) $\xrightarrow { \text { oxidised } }$ O2 (has 2 unpaired electrons in antibonding MO).

So, paramagnetic moment increases.