[X] + dil. H_{2}SO_{4} longrightarrow [Y]:Col | vedclass

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(A) According to the question, $[X] +$ dil. $H_{2}SO_{4} \longrightarrow [Y]$ (a colourless, suffocating gas).$[Y] + K_{2}Cr_{2}O_{7} + H_{2}SO_{4} \l

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$SO_{3}^{2-}, SO_{2}$

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(A) According to the question, $[X] +$ dil. $H_{2}SO_{4} \longrightarrow [Y]$ (a colourless, suffocating gas).$[Y] + K_{2}Cr_{2}O_{7} + H_{2}SO_{4} \longrightarrow$ Green colouration of the solution.Sulphites $(SO_{3}^{2-})$ react with dil. $H_{2}SO_{4}$ to release sulphur dioxide $(SO_{2})$ gas, which is colourless and has a suffocating odour.The reaction is: $SO_{3}^{2-} + 2H^{+} \longrightarrow SO_{2} + H_{2}O$.$SO_{2}$ acts as a reducing agent and reduces acidified potassium dichromate $(K_{2}Cr_{2}O_{7})$ from $Cr(VI)$ (orange) to $Cr(III)$ (green) as $Cr_{2}(SO_{4})_{3}$.The reaction is: $K_{2}Cr_{2}O_{7} + H_{2}SO_{4} + 3SO_{2} \longrightarrow K_{2}SO_{4} + Cr_{2}(SO_{4})_{3} + H_{2}O$.

$[X] +$ dil. $H_{2}SO_{4} \longrightarrow [Y]:$
Colourless, suffocating gas
$[Y] + K_{2}Cr_{2}O_{7} + H_{2}SO_{4} \longrightarrow$
Green colouration of solution
Then, $[X]$ and $[Y]$ are

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$[X] +$ dil. $H_{2}SO_{4} \longrightarrow [Y]:$Colourless, suffocating gas$[Y] + K_{2}Cr_{2}O_{7} + H_{2}SO_{4} \longrightarrow$Green colouration of solutionThen, $[X]$ and $[Y]$ are