1.

Which of the following is the most powerful oxidising agent?

Answer»

`F_(2)`
`O_(2)`
`Br_(2)`
`I_(2)`

SOLUTION :Acidified `K_(2)Cr_(2)O_(7)` solution oxidises `SO_(2)" into "Cr_(2)(SO_(4))_(3)`.
`3S overset(+4)(O_(2))+K_(2)Cr_(2)O_(7)+H_(2)SO_(4) to K_(2)SO_(4) +Cr_(2) (overset(+6)(SO)_(4))_(3)+H_(2)O`
Hence, oxidation state of SULPHUR changes from +4 to +6.


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