Number of identical \( \mathrm{Cr}-\mathrm{O} \) bonds in dichromate ion \( \mathrm{Cr}_{2} \mat...

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Number of identical \( \mathrm{Cr}-\mathrm{O} \) bonds in dichromate ion \( \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \) is :
(a) 4
(b) 6
(c) 7
(d) 8
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