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How many of the following are square pal...

How many of the following are square palanar?
(a) `Ni(dmg)_(2)" "(b) [Ni(CN)_(4)]^(2-)`
`(c ) [Ni(CN)_(4)]^(4-)" "(d) [Ni(CO)_(4)]`
(e ) `[Ni(Cl)_(4)]^(2-)" "(f) K_(2)Cr_(2)O_(7)`
(g) `K_(2)CrO_(4)" "(h) KMnO_(4)`
`(i) K_(2)MnO_(4)" "(j) CrO_(2)Cl_(2)`

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Verified by Experts

The correct Answer is:
2
(a),(b) are square planar.
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