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Four species are listed below: (i) HCO...

Four species are listed below:
(`i`) `HCO_(3)^(-)`
(`ii`) `H_(3)O^(+)`
(`iii`) `HSO_(4)^(-)`
(`iv`) `HSO_(3)F`
Which one of the following is the correct sequence of their acid strength?

A

`iv lt ii lt iii lt i`

B

`ii lt iii lt i lt iv`

C

`i lt iii lt ii lt iv`

D

`iii lt i lt iv lt ii`

Text Solution

Verified by Experts

The correct Answer is:
C
The `pK_(a)` values of `HCO_(3)^(-) , H_(3)O^(+)` and `HSO_(4)^(-)` are 10.25, –1.74 and 1.92 respectively and `HSO_(3)F` is super acid. `(iv) gt (ii) gt (iii) gt (i)`
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