On treating a compound with warm dil. H2SO4, gas X is evolved which turns K2Cr2O7 paper acidified

On treating a compound with warm dil. H₂SO₄, gas X is evolved which turns K₂Cr₂O₇paper acidified with dil. H₂SO₄ to a green compound Y. X and Y respectively are -

(1) X = SO₂, Y = Cr₂O₃

(2) X = SO₃, Y = Cr₂O₃

(3) X = SO₂, Y = Cr₂(SO₄)₃

(4) X = SO₃, Y = Cr₂(SO₄)₃

On treating a compound with warm dil. H2SO4, gas X is evolved which turns K2Cr2O7 paper acidified

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