How many given complexes are diamagnetic out of following?
[AuCl $_{4}$ ] $^{-}$
[Co(H $_{2}$ O) $_{6}$ ] $^{3 +}$
[Co(CO) $_{4}$ ] $^{-}$ .

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Solution

[AuCl $_{4}$ ] $^{-}$
$A u^{+ 3} = d^{8}$ configuration so it will not have any unpaired electron
[Co(H $_{2}$ O) $_{6}$ ] $^{3 +}$
$C o^{+ 3} = d^{6} d^{2} s p^{3}$ hybridization so it doesnt have unpaired electron
Co(CO) $_{4}$ ] $^{-}$
$d^{8} d s p^{2}$ hybridization so it doesnt have unpaired electron.
As they all have no unpaired electron so they all are diamagnetic.

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