Teaching UP PGT Mock Test Series 2024 General Science Chemistry Chemical Reaction

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

1
X = SO3, Y = Cr2(SO4)3
2
X = SO2, Y = Cr2(SO4)3
3
X = SO3, Y = Cr2O3
4
X = SO2, Y = Cr2O3 
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