Question

Select the compound in which chlorine shows oxidation state $+7$.

• A. $HCl{O}_4$
• B. $HCl{O}_3$
• C. $HCl{O}_2$
• D. $HClO$

Answer 1

The correct option is A $HCl{O}_4$

Let oxidation state of chlorine is $x$.

In $HCl{O}_4$, $1+x+4(-2)=0$

$x=+7$

In $HCl{O}_3$, $1+x+3(-2)=0$

$x=+5$

In $HCl{O}_2$, $1+x+2(-2)=0$

$x=+3$

In $HCl{O}^{}$, $1+x+1(-2)=0$

$x=+1$

So $HCl{O}_4$ is correct answer.