Allthe following complexes show a decrea...

Allthe following complexes show a decrease in their weights when placed in a magnetic balance. Then which of the these has square planar geometry ?

`Ni(CO)_(4)`

`K[AgF_(4)]`

`Na_(2)[Zn(CN)_(4)]`

None of these

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The correct Answer is:

In `K[AgF_(4)],Ag(III)` has `4d^(8)` configuration. This has higher CFSE which favours pairing of electrons and thus complex is diamagnetic and square planar.

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