Question

Assertion : For drying $H_{2}S$, Conc. $H_{2}S{O}_4$ cannot be used.

Reason: Moist $H_{2}S$ is oxidized by Conc.$H_{2}S{O}_4$

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is

A

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

$Conc.H_{2}S{O}_4$ Due to its strong affinity for water concentrated acid acts as a powerful dehydrating agent. Its corrosive action on the skin is due to this property.

Drying of gases: Many wet gases like carbon dioxide, sulphur dioxide, chlorine,

hydrogen chloride, etc. which have no action with acid, are dried by bubbling into the

concentrated sulphuric acid.

Moist hydrogen cannot be dried over conc.$H_{2}S{O}_4$ because it is oxidized by $H_{2}S{O}_4$ and catches fire.

The reaction is,

$H_{2}S{O}_4+H_{2}S\to H_{2}O+S{O}_2+S$

Hence option A is correct answer.