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[X] + dil. H2SO4 → [Y] : Colourless, suffocating gas [Y] + K2Cr2O7 + H2SO4 → Green colouration of solution

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[X] + dil. H2SO4 → [Y] : Colourless, suffocating gas 

[Y] + K2Cr2O7 + H2SO4 → Green colouration of solution 

Then, [X] and [Y] are 

(A) SO2-3, SO2 

(B) Cl– , HCl 

(C) S2–, H2S 

(D) CO2-3, CO2

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Best answer

The correct option (A) SO2-3, SO2  

Explanation:

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