MCQ
The diamagnetic specie is
- ✓${[Ni{(CN)_4}]^{2 - }}$
- B${[NiC{l_4}]^{2 - }}$
- C${[CoC{l_4}]^{2 - }}$
- D${[Co{F_6}]^{2 - }}$

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$R, S$ and $\mu$ respectively are

Reason : Cuprous ion $(Cu^+)$ is colourless whereas cupric ion $(Cu^{2+})$ is blue in the aqueous solution.
