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The formula of potassium dicyanobis(oxal...

The formula of potassium dicyanobis(oxalato) nickelate (II) is

A

`K _(4) [ Ni (CN) (Ox) _(2) ]`

B

`K _(3) [ Ni _(2) ( CN) _(2) ( Ox) _(2) ]`

C

`K _(4) [ Ni ( CN) _(2) (Ox) _(2) ]`

D

`K _(2) [Ni ( CN) _(2) (Ox) _(2) ]`

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