-X-H2SO4- -Y- a colorless gas with irritating smell- -Y-K2Cr2O7-H2SO4- Green solution- -X- and -Y- is-

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Sulphuric Acid

[X]+H2SO4→ [Y...

Question

$[X] + H_{2} S O_{4} \to [Y]$ a colorless 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 A $S O_{3}^{2 -}, S O_{2}$
Dilute $H C l$ or $H_{2} S O_{4}$ decomposes sulphites with the evolution of sulphur dioxide.
$S O_{3}^{2 -} + 2 H^{+} \to S O_{2} ↑ + H_{2} O$
$3 S O_{2} ↑ + C r_{2} O_{7}^{2 -} o r a n g e + 2 H^{+} \to 3 S O_{4}^{2 -} + 2 C r^{3 +} G r e e n + H_{2} O$

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[X]+H2SO4→[Y] a colorless gas with irritating smell, [Y]+K2Cr2O7+H2SO4→ Green solution, [X] and [Y] is:

The correct option is A SO2−3,SO2Dilute HCl or H2SO4 decomposes sulphites with the evolution of sulphur dioxide.SO2−3+2H+→SO2↑+H2O3SO2↑+Cr2O2−7orange+2H+→3SO2−4+2Cr3+Green+H2O

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