Assertion : $H C l O_{4}$ is a stronger acid than $H C l O_{3}$ . Reason: Oxidation state of chlorine in $H C l O_{4}$ is +7 and in $H C l O_{3}$ is +5.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Acidity order of acids,
$H C l O_{4} > H C l O_{3} > H C l O_{2} > H C l O$
Oxidation states of $C l$ in-
$(i)$ $H C l O_{4} \Rightarrow$
$+ 1 + x - 2 (4) = 0$
$⟹ x + 1 - 8 = 0$
$⟹ x - 7 = 0$
$⟹ x = + 7$
$(i i)$ $H C l O_{3} \Rightarrow$
$⟹ x + 1 - 6 = 0$
$⟹ x - 5 = 0$
$⟹ x = + 5$

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Assertion :HClO4 is a stronger acid than HClO3. Reason: Oxidation state of chlorine in HClO4 is +7 and in HClO3 is +5.

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for AssertionAcidity order of acids,HClO4>HClO3>HClO2>HClOOxidation states of Cl in-(i) HClO4⇒ +1+x−2(4)=0⟹x+1−8=0⟹x−7=0⟹x=+7(ii) HClO3⇒⟹x+1−6=0⟹x−5=0⟹x=+5

Assertion : $H C l O_{4}$ is a stronger acid than $H C l O_{3}$ . Reason: Oxidation state of chlorine in $H C l O_{4}$ is +7 and in $H C l O_{3}$ is +5.