First slide

Oxoacids of Halogens

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.

Moderate

A

Both Statement 1 and Statement 2 are true
B

Both Statement 1 and Statement 2 are false
C

Statement 1 is true but Statement 2 is false.
D

Statement 1 is false but Statement 2 is true.

Solution

Both statements are true and 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 ${(HO)}_{m} {ZO}_{n}$ 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 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 strongly away from the H-atom. The net effect makes it easier from the proton release and increases the acid strength.

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