A) \[80%{{H}_{2}}S{{O}_{4}}~~\]
B) \[98%{{H}_{2}}S{{O}_{4}}~~\]
C) \[50%{{H}_{2}}S{{O}_{4}}~~\]
D) \[20%{{H}_{2}}{{S}_{2}}{{O}_{7}}~~\]
Correct Answer: B
Solution :
\[\because \] 98% \[{{H}_{2}}S{{O}_{4}}\] is used for absorbing dense fog of acid which is formed by dissolving \[S{{O}_{3}}\] in water. \[\therefore \] 98% \[{{H}_{2}}S{{O}_{4}}\] is the most efficient reagent for absorption of \[S{{O}_{3}}\].
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