Which gas is not effectively dried using concentrated sulfuric acid?

Group VA and VIA Elements MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
Group VA and VIA Elementschemistry-mcqs › group-va-and-via-elements
Published
18 Mar 2019
Last updated
28 May 2026

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Explanation

Concentrated H2SO4 is a strong dehydrating agent and can dry most gases. However, it cannot dry hydrogen sulfide (H2S) because H2S reacts with H2SO4, preventing effective drying. Other gases like SO2, CO2, and C2H4 do not react with concentrated sulfuric acid and can be dried using it.

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