For drying H(2)S gas concentrated H(2)SO...

For drying `H_(2)S` gas concentrated `H_(2)SO_(4)` can not be used why ?

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On passing `H_(2)S` gas through a solution of `SO_(2),` oxidiation of `H_(2)S` occurs.The particles of sulphur that arre formed get condensed to be in the colloidal range. Therefore, the milky solution contains colloidal particales of sulphur.
`" "2H_(2)S+SO_(2)to overset("Colloidal") 3S+2H_(2)O`

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