Assertion: `HClO_(4)` is a stronger acid than `HClO_(3)`.
Reason: Oxidation state of `Cl` in `HClO_(4)` is `+VII` and in `HClO_(3)+V`.

Options

A. If both assertion and reason are true, and reason is the correct explanation of the assertion.
B. If both assertion and reason are ture, but reason is not the correct explanantion of the assertion.
C. If assertion is true, but reason is false.
D. If both assertion and reason are false

Answer

B

Explanation

Correct explanation. Due to higer (+7) O.S. of Cl in `HClO_(4)` than in `HClO_(3)` (+5), the `ClO_(3)` part of `HClO_(4)` pulls the electrons of the O-H more strongly than `ClO_(2)` part in `HClO_(3)`. As a result, the O-H bond in `HClO_(4)` can break more easily to liberate a proton than in `HClO_(3)` and hence `HClO_(4)` is more acidic than `HClO_(3)`.