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Q.

On treating a compound with warm dil. H2SO4 , gas  is evolved which turns K2Cr2O7 paper acidified with dil. H2SO4 to a green compound Y, X and Y respectively are:

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a

X=SO2,Y=Cr2O3

b

X=SO3,Y=Cr2O3

c

X=SO3,Y=Cr2SO43

d

X=SO2,Y=Cr2SO43

answer is D.

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Detailed Solution

SO2greduces acidified dichromate to chromium sulphate, Cr2SO43 which is green in colour.
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