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Number of Cr-O sigma bonds in dichromate...

Number of Cr-O sigma bonds in dichromate in `Cr_(2)O_(7)^(2-)` is

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The correct Answer is:
8
`""^(Ө)O- overset(O)overset(||)underset(O)underset(||)Cr-O-overset(O)overset(||)underset(O)underset(||)Cr-O^(Ө)`
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