Question

\([\mathrm{X}]+\) dil. \(\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow[\mathrm{Y}]:\) Colourless, suffocating gas
\([\mathrm{Y}]+\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow\) Green colouration of solution
Then, \([\mathrm{X}]\) and \([\mathrm{Y}]\) are
(A) \(\mathrm{SO}_{3}^{2-}, \mathrm{SO}_{2}\)
(B) \(\mathrm{Cl}^{-}, \mathrm{HCl}\)
(C) \(\mathrm{S}^{2-}, \mathrm{H}_{2} \mathrm{~S}\)
(D) \(\mathrm{CO}_{3}^{2-}, \mathrm{CO}_{2}\)

Answer 1

Ans: (A)
 \(\mathrm{SO}_{3}^{2-}+\) dil \(\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{SO}_{2}+\mathrm{H}_{2} \mathrm{O}+\mathrm{SO}_{4}^{2-}\)
$$
3 \mathrm{SO}_{2}+\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow \mathrm{K}_{2} \mathrm{SO}_{4}+\underset{\text { green }}{\mathrm{Cr}_{2}}\left(\mathrm{SO}_{4}\right)_{3}+4 \mathrm{H}_{2} \mathrm{O}
$$
\(\mathrm{SO}_{2}\) is a colourless gas with suffocating smell.

Answer 2

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Answer 3

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