Question

What is the oxidation number of $H$ and $Cl$ in $HCl{O}_4$ respectively?

• A. $+1,+7$
• B. $+2,+6$
• C. $+3,+7$
• D. $+2,+7$

Answer 1

The correct option is A $+1,+7$

The oxidation number of $H=+1$

Let the oxidation number of $Cl$ be $x.$

$(+1)\times 1+(+x)\times 1+(-2)\times 4=0$

$\Rightarrow x=8-1=+7$

$\therefore$ Oxidation number of $Cl$ is $+7$ .

Therefore, the correct option is A.