The oxidation number of underlined element in $C r - - - O_{2} C l_{2}$ compound is :

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None of these

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Solution

The correct option is A 6
Let X be the oxidation number of Cr in $C r - - - O_{2} C l_{2}$ .
$X + 2 (- 2) + 2 (- 1) = 0$
$X = + 6$ .
Hence, the correct option is A.

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