-X- - H2SO4 - -Y- a colouriess gas with suffocating smell-Y- - K2Cr2O7-H2SO4 - green solution but a slightly coloured precipitate is not formed- X Y are -

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Introduction to Inorganic Chemistry

[X] + H2SO4...

Question

[X] + $H_{2} S O_{4} \to$ [Y] a colouriess gas with suffocating smell.
[Y] + $K_{2} C r_{2} O_{7} + H_{2} S O_{4} \to$ green solution but a slightly coloured precipitate is not formed. X & Y are :

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 A $S O_{3}^{2 -}, S O_{2}$
Sulphite gives $S O_{2}$ with $H_{2} S O_{4}$ which turns acidified $K_{2} C r_{2} O_{7}$ green according to following reaction:
$K_{2} C r_{2} O_{7} + H_{2} S O_{4} + 3 S O_{2} \to K_{2} S O_{4} + C r_{2} (S O_{4})_{3} (g r e e n) + H_{2} O .$
$H_{2} S$ also gives green coloured solution with acidified $K_{2} C r_{2} O_{7}$ solution but a slightly coloured precipitate of sulphur is also obtained. The $H_{2} S$ gas has rotten egg smell.

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[X] + H2SO4→ [Y] a colouriess gas with suffocating smell.[Y] + K2Cr2O7+H2SO4→ green solution but a slightly coloured precipitate is not formed. X & Y are :

[X] + $H_{2} S O_{4} \to$ [Y] a colouriess gas with suffocating smell.
[Y] + $K_{2} C r_{2} O_{7} + H_{2} S O_{4} \to$ green solution but a slightly coloured precipitate is not formed. X & Y are :