Question

Oxidation states of chlorine in $HCl{O}_4$ and $HCl{O}_3$ are:

• A. $+4,+3$
• B. $+7,+5$
• C. $+3,+4$
• D. $+5,+7$

Answer 1

The correct option is B $+7,+5$

Let the oxidation state of chlorine be x an y in $HCl{O}_4$ and $HCl{O}_3$.

The oxidation state of $H$ and $O$ in $HCl{O}_4$ and $HCl{O}_3$ is +1 and -2 respectively.

$HCl{O}_4$ and $HCl{O}_3$.

$HCl{O}_4:+1+x-8=0,x=+7$

$HCl{O}_3:+1+x-6=0,y=+5$.