Which one of the following is an inner orbital complex as well as diamagnetic in nature?

Options

A. `[Zn(NH_(3))_(6)]^(2+)`
B. `[Cr(NH_(3))_(6)]^(3+)`
C. `[Co(NH_(3))_(6)]^(3+)`
D. `[Ni(NH_(3))_(6)]^(2+)`

Answer

C

Explanation

`[Zn(NH_(3))_(6)]^(2+) implies`
It is an outr orbital complex and diamagnetic in nature
`[Cr(NH_(3))_(6)]^(3+) implies`
It is an inner obital complex and is paramagnetic in nature
`[Co(NH_(3))_(6)]^(3+) implies`
It is an inner orbital complex and is diamagnetic in nature.
`[Ni(NH_(3))_(6)]^(2+) implies`
It is an outer orbital complex and is paramagnetic in nature.