• # question_answer The most efficient agent for the absorption of $S{{O}_{3}}$ is [KCET 1998] A) $98%{{H}_{2}}S{{O}_{4}}$ B) $80%{{H}_{2}}S{{O}_{4}}$ C) $20%$oleum D) $90%{{H}_{2}}S{{O}_{4}}$

$\underset{\text{98 }\!\!%\!\!\text{ }}{\mathop{{{H}_{2}}S{{O}_{4}}}}\,+S{{O}_{3}}\,\,\to \,\,\underset{(\text{Fuming}\,{{H}_{2}}S{{O}_{4}})}{\mathop{\underset{\text{Oleum}}{\mathop{{{H}_{2}}{{S}_{2}}{{O}_{7}}}}\,}}\,$