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(B) $SO_3$ is not absorbed directly in water because it forms a dense fog of $H_2SO_4$ droplets which is difficult to condense. To avoid this,$SO_3$ i

Vedclass · Accepted Answer

$98\% \; H_2SO_4$

Vedclass · Answer

(B) $SO_3$ is not absorbed directly in water because it forms a dense fog of $H_2SO_4$ droplets which is difficult to condense. To avoid this,$SO_3$ is absorbed in $98\% \; H_2SO_4$ to form oleum $(H_2S_2O_7)$,which is then diluted with water to obtain $H_2SO_4$ of the desired concentration. Therefore,$98\% \; H_2SO_4$ is the most efficient agent for the absorption of $SO_3$.

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

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