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In the dichromate ion (Cr2O7²-):

1. 4 Cr-O bonds are equivalent
2. 6 Cr-O bonds are equivalent
3. all Cr-O bonds are equivalent
4. all Cr-O bonds are non-equivalent

Correct answer: 6 Cr-O bonds are equivalent

Solution

In Cr2O7²- each Cr is bonded to three terminal oxygens (six terminal Cr-O bonds, all equivalent) plus one bridging oxygen; the two Cr-O(bridge) bonds are longer and different, so only 6 Cr-O bonds are equivalent.

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