How is the presence of {SO}₂ detected?

NCERT Class XII Chemistry
Chapter - The p-Block Elements
Questions with Solutions

Question : 62 of 74

Marks: +1, -0

How is the presence of

\mathrm{SO}_2

detected?

Solution:

Presence of

\mathrm{SO}_2

is detected by bringing a paper dipped in acidifiedpotassium dichromate near the gas. If the paper turns green, it shows thepresence of

\mathrm{SO}_2

gas.

\underset{\text{Orange}}{\mathrm{K}_2\mathrm{Cr}_2\mathrm{O}_7} + \mathrm{H}_2\mathrm{SO}_4 + 3\mathrm{SO}_2 \rightarrow \mathrm{K}_2\mathrm{SO}_4 + \underset{\text{Green}}{\mathrm{Cr}_2(\mathrm{SO}_4)_3} + \mathrm{H}_2\mathrm{O}

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