Q. 12 B3.6( 14 Votes )

How do you count for the following observations?

When concentrated sulphuric acid is added to an inorganic mixture containing chloride, we get colourless pungent smelling gas HCl, but if the mixture contains bromide then we get red vapour of bromine. Why?

Answer :

When conc. H2SO4 is added to an inorganic mixture containing bromide, initially HBr is produced. HBr, being strong reducing agent reduces H2SO4 to SO2with the evolution of red vapour of bromine.



But, when conc. H2SO4 is added to an inorganic mixture containing chloride, a pungent smelling gas(HCl) is evolved. HCl being a weak reducing agent cannot reduce H2SO4 to SO2.


2NaCl + 2H2SO4 2NaHSO4 + 2HCl


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