Question

An acid radical (A) when treated with dil. $\mathrm{H}_2 \mathrm{SO}_4$, a colourless gas (B) comes out which is suffocating with the smell of burning sulphur. Gas B when treated with $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ acidified with dil. $\mathrm{H}_2 \mathrm{SO}_4$, green colour appeared. $\mathrm{A}$ and $\mathrm{B}$ are respectively

Accepted Answer

$\mathrm{SO}_3^{2-}$ and $\mathrm{SO}_2$

Answer

$\mathrm{S}^{2-}$ and $\mathrm{SO}_2$

Answer

$\mathrm{S}^{2-}$ and $\mathrm{H}_2 \mathrm{S}$

Answer

$\mathrm{NO}_2^{-}$ and $\mathrm{NO}_2$

JEE CHEMISTRY MCQ: d & f- BLOCK ELEMENTS

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