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Question

Assertion: HClO4 is a strong acid than HClO3.
Reason: Oxidation state of Cl in HClO4 is +7 and in HClO3, it is + 5.

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

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 HClO4 ;
+1+x+ (4×(2) = 0
So,x=1+8
=7
Hence. the oxidation state of Cl in HClO4 is 7.
Let us calculate the oxidation state of Cl in HClO3 ;
+1+x+ (3×(2) =0
So, x=1+6
=5
Hence. the oxidation state of Cl in HClO4 is 5.
So, we conclude that the oxidation state of Cl is less in HClO3 than HClO4

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