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Assertion: In Cr2O7^(2-) ion, all the Cr...

Assertion: In `Cr_2O_7^(2-)` ion, all the `Cr-O` bond lengths are equal.
Reason: In `Cr_2O_7^(2-)` ion all the `O-Cr-O` bond angles are equal.

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Correct A. Two Cr-O bonds have different bond lengths than the remaining six Cr-O bonds.
Correct R. Cr-O-Cr bond in the middle is different from other O-Cr-O bond angles.
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