From the following information $\mathrm{X}+\mathrm{H}_{2} \mathrm{SO}_{4} ightarrow \mathrm{Y}$ (a…

From the following information $\mathrm{X}+\mathrm{H}_{2} \mathrm{SO}_{4} ightarrow \mathrm{Y}$ (a colourless and irritating gas)
$\mathrm{Y}+\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{H}_{2} \mathrm{SO}_{4} ightarrow$ (green coloured solution)
Identify the pair $\mathrm{X}$ and $\mathrm{Y}$.
  1. $\overline{\mathrm{Cr}}, \mathrm{HCl}$
  2. $\mathrm{SO}_{3}^{2-}, \mathrm{SO}_{2}$
  3. $\mathrm{S}^{2-}, \mathrm{H}_{2} \mathrm{~S}$
  4. $\mathrm{CO}_{3}^{2-}, \mathrm{CO}_{2}$

Asked in: JEE-TOPICTESTS-CHEMISTRY

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