Question

Statement 1:$HClO_{4}$ is a stronger acid than $HClO_{3}$.
Statement 2: Oxidation state of $Cl$ in $HClO_{4}$ is +VII and in $HClO_{3} + V$.

• A. If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation of the statement 1.
• B. Ifboth Statement 1 and Statement 2 are true but statement 2 is not the correct explanation of the statement 1.
• C. If Statement 1 is true but Statement 2 is false.
• D. If Statement 1 is false but Statement 2 is true.

Answer 1

Answer: (B)

Both statements are true but statement 2 is not the correct explanation of statement 1. Greater the number of negative atoms present in the oxy-acid make the acid stronger. In general, the strengths of acids that have general formula (HO)m ZOn can be related to the value of n. As the 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 moreeffective in withdrawing electron density away from the oxygen atom that bonded to hydrogen, in turn, the electrons of H - O bond are drawn more strongly away from the H-atom. The net effect makes it easier from the proton release and increases the acid strength