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Which of the following is the correct order of acidic strength?

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Which of the following is the correct order of acidic strength?

(a) HClO4 < HClO4 < HClO2

(b) HClO4 = HClO3 = HClO2

(c) HClO4> HClO3 > HClO2

(d) HClO2 > HClO4 > HClO3

This question was addressed to me in an interview.

The doubt is from P-Block Elements topic in chapter P-Block Elements of Chemistry – Class 12

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Correct option is (c) HClO4> HClO3 > HClO2

The explanation is: Acidic strength of oxoacids of the same halogen increases with increase in the oxidation number of the halogen. The oxidation number of halogens in HClO4, HClO3 and HClO2 is 7, 5 and 3 so the Acidic strength of HClO4 is greatest followed by HClO4 and HClO2.

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