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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
(iii)<(i)<(iv)<(ii)
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B
(iv)<(ii)<(iii)<(i)
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C
(ii)<(iii)<(i)<(iv)
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D
(i)<(iii)<(ii)<(iv)
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Solution

The correct option is D (i)<(iii)<(ii)<(iv)
The order of acidic strength is
HCO3<HSO4<H3O+<HSO3F
HSO3F is super acid and it is the most acidic among them. H3O+ is more acidic than anions because anions (HCO3,HSO4) do not release H+ ion easily. HSO4 is more acidic than HCO3 because sulphur is more electronegative than carbon.

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