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In Cr2O7^(2-) all Cr-O bonds are equiva...

In` Cr_2O_7^(2-)` all Cr-O bonds are equivalent.

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False. Two Cr-o bonds which share an oxygen atom at the common vertex of the two tetrahedral units are longer than the other six equivalent Cr-O bonds.
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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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the number of moles of Cr_(2)O_(7)^(2) needed to oxidise 0.136 equivalent of N_(2)H_(5) through the reaction: N_(2)H_(5) + Cr_(2)O_(7)^(2-) rarr N_(2) + Cr^(3) + H_(2)O is: