Question

Arrange the following in increasing order of oxidation state of Ni.
`K_(2)[Ni(CN)_(4)],K_(2)[NiF_(6)],Ni(CO)_(4)`
A. `Ni(CO)_(4), K_(2)[Ni(CN)_(4)], K_(2)[NiF_(6)]`
B. `K_(2)[Ni(CN)_(4)], Ni(CO)_(4), K_(2)[NiF_(6)]`
C. `Ni(CO)_(4), K_(2)[NiF_(6)], K_(2)[Ni(CN)_(4)]`
D. `K_(2)[NiF_(6)], K_(2)[Ni(CN)_(4)], Ni(CO)_(4)`

Answer 1

Correct Answer - A
`K_(2)[Ni(CN)_(4)]:+2+x+4(-1)=0 rArr x=+2`
`K_(2)[NiF_(6)]:+2+x+6(-1)=0 rArr x=+4`
`Ni(CO)_(4):x+0=0 rArr x=0`