Question

Calculate the oxidation number of Chlorine $\left(Cl\right)$ in
$Ca(Cl{O}_2{)}_2$

• A. $+1$
• B. $+2$
• C. $+3$
• D. $-1$

Answer 1

The correct option is C $+3$

Let oxidation number of Cl be 'x' in $Ca(Cl{O}_2{)}_2$
$\text{charge on}O=-2$
$\text{charge on}Ca=+2$
$\Rightarrow 2+2x+4\times -2=0$
$\Rightarrow x=+3$