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  4. The most efficient agent for the absorption of SO3 is

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Q. The most efficient agent for the absorption of $ SO_3 $ is

UPSEEUPSEE 2012The p-Block Elements

Solution:

$\because 98 \% H _{2} SO _{4}$ is used for absorbing dense fog of acid which is formed by dissolving $SO _{3}$ in water.

$\therefore 98 \% H _{2} SO _{4}$ is the most efficient reagent for absorption of $SO _{3}$.