-X-H2SO4-Y- a colourless gas with irritating smell -Y-K2Cr2O7-H2SO4- green solution -X- and -Y- is-

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[X]+H2SO4→[Y]...

Question

$[X] + H_{2} S O_{4} \to [Y]$ a colourless gas with irritating smell
$[Y] + K_{2} C r_{2} O_{7} + H_{2} S O_{4} \to$ green solution
$[X]$ and $[Y]$ is:

S O_{3}^{2 -}

S O_{2}

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{C l}^{-}

H C l

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S^{2 -}, H_{2} S

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C {O_{3}}^{2 -}

C O_{2}

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Solution

The correct option is B $S O_{3}^{2 -}$ , $S O_{2}$
Option (A) is correct.

$[X]$ and $[Y]$ are $S O_{3}^{2 -}$ and $S O_{2}$ respectively.

$S O 3^{2 -}$ reacts with sulphuric acid to form sulphur dioxide which is a colourless gas with irritating smell.

$S O_{3}^{2 -}$ + $H_{2} S O_{4} \to$ $S O_{2}$ (a colourless gas with irritating smell) + $H_{2} O$

Potassium dichromate oxidizes sulphur dioxide to green solution of chromium sulphate.
$S O_{2} + K_{2} C r_{2} O_{7} + H_{2} S O_{4} \to$ $C r_{2} (S O_{4})_{3} (g r e e n s o l u t i o n) + K_{2} S O_{4} + H_{2} O$ .

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[X]+H2SO4→[Y] a colourless gas with irritating smell [Y]+K2Cr2O7+H2SO4→ green solution[X] and [Y] is:

$[X] + H_{2} S O_{4} \to [Y]$ a colourless gas with irritating smell
$[Y] + K_{2} C r_{2} O_{7} + H_{2} S O_{4} \to$ green solution
$[X]$ and $[Y]$ is: