1.

Among the following oxoacids, the correct decreasing order of acid strength is

Answer»

`HClO_(2) gt HClO_(4) gt HClO_(3) gt HOCl`
`HOCl gt HClO_(2) gt HClO_(3) gt HOCl_(4)`
`HClO_(4) gt HOCl gt HClO_(2) gt HClO_(3)`
`HClO_(4) gt HClO_(3) gt HClO_(2) gt HOCl`

Solution :As the oxidation number of Cl decreases from +7 in `HClO_(4)` to +5 in `HClO_(3)` to +3 in `HClO_(2)` and +1 in HOCl, its tendency to ATTRACT the electrons of the O-H bond decreases. As a result, the tendency of the O-H bond to dissociate to give `H^(+)` ions decreases and hence the ACID strength decreases accordingly in the order : `HClO_(4) gt HClO_(3) gt HClO_(2) gt HOCl`.


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