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Question:

The correct order of acid strength is.

HClO<HClO2<HClO3<HClO4

HClO4<HClO3<HClO2<HClO

HClO4<HClO<HClO2<HClO3

HClO2<HClO3<HClO4<HClO

Solution:

Correct order of acid strength is:HClO+1<HClO2+3<HClO3+5<HClO4+7(∝acid strength∝oxidation number)Hence, option A is correct.