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Question:

Among the following oxoacids, the correct decreasing order of acid strength is:

HClO2>HClO4>HClO3>HOCl

HOCl>HClO2>HClO3>HClO4

HClO4>HClO3>HClO2>HOCl

HClO4>HOCl>HClO2>HClO3

Solution:

Acidic strength∝Oxidation number
Increasing acid strength due to an increase in the oxidation state of the central atom.
HClO<HClO2<HClO3<HClO4
+1 +3 +5 +7
Hence, option A is correct.