In ${C r_{2} O_{7}}^{2 -}$ ion, the maximum number of bonds having the same Cr - O bond length is :

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Solution

The correct option is C 6
In $C r_{2} O_{7}^{2 -}$ ion, 6 $(C r - O)$ bonds have the same bond length 163 pm because of the resonance and 2 $(C r - O)$ bonds have a bond length of 179 pm.

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Number of $C r - O$ bonds in dichromate ion $(C r_{2} O_{7}^{2 -})$ is:

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