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Question
A gas when passed through K2Cr2O7 and dil. H2SO4 solution turns it green, the gas is
(A) CO2
(B) NH3
(C) SO2
(D) Cl2
Solution
(C) SO2
Sulphur dioxide gas is oxidized to sulphuric acid when passed through acidified
potassium dichromate solution. The colour of the solution changes from orange to
green because potassium dichromate is reduced to chromic sulphate.
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