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CGP EDU Academic Team
Published on: August 12, 2026
H 2 S and SO 2 can be distinguished by :
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(a,b,c)
H 2 S, SO 2 both are acidic so turns blue litmus red but SO 2 is a bleaching agent which turns red litmus colourless.
MnO 4 – /H + oxidising agent, so SO 2 is oxidised to SO 4 2– & H 2 S is oxidized to sulphur
Pb 2+ + S 2– 
PbS (black ppt.), SO 2 will not give black precipitate so can be distinguished.
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