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Question

Which of the following is the strongest acid?


A

HClO

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B

HClO3

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C

HClO4

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D

HClO2

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Solution

The correct option is C

HClO4


More the % oxygen content, more the acidic nature.
The charge stabilization of oxyacids of chlorine increases in the order:
ClO<ClO2 < ClO3 < ClO4

which signifies that ClO will have minimum stability and therefore, will have maximum attraction for H+. Thus, ClO will be strongest base and so its conjugate acid HClO will be the weakest acid. Similarly, in this series ClO4 is the weakest base (maximum stabilized) and its conjugate acid HClO4 is the strongest acid.


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