Calculate the oxidation number of underlined elements in the following compounds:
$Z n - - O_{2}^{2 -}$

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-2

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Solution

The correct option is A 2
Let oxidation number of Zn be 'x' in $Z n O_{2}^{2 -}$
$charge on O = - 2$
$Total charge on species = - 2$
$\Rightarrow x + 2 \times - 2 = - 2$
$\Rightarrow x = + 2$

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