The total number of \( \mathrm{Mn}=\mathrm{O} \) bonds in \( \mathrm{Mn}_{2} \mathrm{O}_{7} \) i...

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The total number of \( \mathrm{Mn}=\mathrm{O} \) bonds in \( \mathrm{Mn}_{2} \mathrm{O}_{7} \) is
(a) 4
(b) 5
(c) 6
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