The true statement about the structure of dichromate anion is (a) a...

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The true statement about the structure of dichromate anion is
(a) all the \( \mathrm{Cr}-\mathrm{O} \) bonds are equivalent
(b) only \( 6 \mathrm{Cr}-\mathrm{O} \) bonds are equivalent
(c) only \( 3 \mathrm{Cr}-\mathrm{O} \) bonds are equivalent
(d) no bond is equivalent
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