Assertion :HClO4 is stronger acid than HClO3. Reason: Oxidation state of Cl in HClO4 is +VII and in HClO3; it is +V.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
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 Conjugate base of HClO4 and HClO3 are ClO−4 and ClO−3 respectively.
Hence the size of ClO−4is bigger tha the size of ClO−3 , the stability of ClO−4 will be more.
If the conjugate base of an acid is stable , the acid will be stronger (i.e. acid can easily donate proton).
Hence HClO4 is stronger acid than HClO3
So, Assertion is correct and Reason is not the correct explaination of Assertion.