Assertion: `HClO_(4)` is a stronger acid than `HClO_(3).`
Reason: Oxidation state of chlorine in `HClO_(4)` is +7 and in `HClO_(3)` is +5.

Options

A. If both assertion and reason are true and reason is the explaination of assertion.
B. If both assertion and reason are true but reason is not the correct explaination of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false.

Answer

B

Explanation

Greater the number of negative atoms present in the oxy-acid make the acid stronger.In general,te strengths of acids that have general formula,`(HO)_(m)ZO_(n)`can be related to the valuue of n.As value of n increases,acidic character also increases.The negative atoms draw electrons away from the Z-atom and make it more positive.The Z-atom,therefore,becomes more effective in withdrawing electron density away from the oxygen atom that bonded to hydrogen.In turn,the electrons of `H-O` bond are drawn more stongly away from the H-atom.The net effect makes it easier from the proton release and increases the acid strength.