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JEE MAIN_2026
05-04-26_S2
Question
A paper dipped in a dil. $\mathrm{H}_2 \mathrm{SO}_4$ solution of ' $X$ ' upon treatment with $\mathrm{SO}_2$ gas turns into green. The compound ' $X$ ' is :
Select the correct option:
A
KI-starch
B
$\mathrm{KMnO}_4$
C
$\mathrm{Pb}\left(\mathrm{CH}_3 \mathrm{COO}\right)_2$
D
$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
$\mathrm{SO}_2$ gas acts as reducing agent. $$ \mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+\mathrm{SO}_2 \xrightarrow{\mathrm{H}_2 \mathrm{SO}_4} \underset{\text { Gireen solution }}{\mathrm{Cr}_2}\left(\mathrm{SO}_4\right)_3+\mathrm{SO}_4^{2-} $$
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