Question

Calculate the oxidation number of underlined elements in the following compounds:
$\underset{--}{Zn}{O}_2^{2-}$

• A. 2
• B. -2
• C. 4
• D. \N

Answer 1

The correct option is A 2

Let oxidation number of Zn be 'x' in $Zn{O}_2^{2-}$
$\text{charge on}O=-2$
$\text{Total charge on species}=-2$
$\Rightarrow x+2\times -2=-2$
$\Rightarrow x=+2$