What is the oxidation number of chromium in the dimeric hydroxo bridged species :-

+ 6

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+ 4

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+ 3

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+ 2

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Solution

The correct option is C $+ 3$
let $^{'} C r^{'}$ oxidation state $\to x$
$2 x - 2 = + 4$
$2 x = 6$
$x = 3$
Each chromium shows $+ 3$ oxidation state.

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