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Question

Four species are listed below
i. HCO3
ii. H3O+
iii. HSO4
iv. HSO3F
Which one of the following is the correct sequence of their acid strength?

A
iv < ii < iii < i
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B
ii < iii < i < iv
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C
i < iii < ii < iv
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D
iii < i < iv < ii
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Solution

The correct option is A iv < ii < iii < i
HSO3F is a super acid. Its acidic strength is greater than any given species. The pKa value of other species are
HCO310.25
H3O+1.74
HSO41.92
lesser the pKa value, higher will be its acidic strength. Hence, sequence of acidic strength will be
HSO3F>H3O+>HSO4>HCO3

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