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Question

The correct order of acidic strength of oxyacids of chlorine is:

A
HClO<HClO2<HClO3<HClO4
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B
HClO4<HClO3<HClO2<HClO
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C
HClO>HClO4>HClO3>HClO2
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D
HClO4<HClO2>HClO3>HClO
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Solution

The correct option is A HClO<HClO2<HClO3<HClO4
In HClO4, oxidation number of Cl is +7.
In HClO3, oxidation number of Cl is +5.
In HClO2, oxidation number of Cl is +3.
In HClO1, oxidation number of Cl is +1.
Higher the positive oxidation number, higher is the electron deficiency, and higher is the acidic character. Lewis acids are electron acceptors.
So order is HClO<HClO2<HClO3<HClO4.

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