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Question

In Cr2O72 ion, the maximum number of bonds having the same Cr - O bond length is :

A
5
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B
4
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C
6
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D
3
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Solution

The correct option is C 6
In Cr2O27 ion, 6 (CrO) bonds have the same bond length 163 pm because of the resonance and 2 (CrO) bonds have a bond length of 179 pm.
127787_44729_ans_bddea0993d6641b1bcec5341995b4b14.JPG

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