Question

Assertion: $HCl{O}_4$ is a strong acid than $HCl{O}_3$.
Reason: Oxidation state of Cl in $HCl{O}_4$ is +7 and in $HCl{O}_3$, it is + 5.

• A. If both assertion and reason are true and the reason is a correct explanation of the assertion.
• B. If both assertion and reason are true but reason is not a correct explanation of the assertion
• C. If the assertion is true but reason is false
• D. If both the assertion and reason are false
• E. If the assertion is false but the reason is true

Answer 1

The correct option is A If both assertion and reason are true and the reason is a correct explanation of the assertion.

Let us calculate the oxidation state of Cl in $HCl{O}_4$ ;

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

So,$x=-1+8$

$=7$

Hence. the oxidation state of Cl in $HCl{O}_4$ is 7.

Let us calculate the oxidation state of Cl in $HCl{O}_3$ ;

$+1+x+$ ($3\times (-2)$ $=0$

So, $x=-1+6$

$=5$

Hence. the oxidation state of Cl in $HCl{O}_4$ is 5.

So, we conclude that the oxidation state of Cl is less in $HCl{O}_3$ than $HCl{O}_4$