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Out of the following two Co-ordination e...

Out of the following two Co-ordination entities which is chiral (optically active)?
a) `"cis"-(CrCl_(2)("ox")_(2)]^(3-)` b) `"trans-"[CrCl_(2)("ox")_(2)]^(3-)`

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Out of the two, (a) `"cis" -[CrCl_(2)("ox")_(2)]^(3-)` is chiral (optically active).
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