A) \[98%{{H}_{2}}S{{O}_{4}}\]
B) \[80%{{H}_{2}}S{{O}_{4}}\]
C) \[20%\]oleum
D) \[90%{{H}_{2}}S{{O}_{4}}\]
Correct Answer: A
Solution :
\[\underset{\text{98 }\!\!%\!\!\text{ }}{\mathop{{{H}_{2}}S{{O}_{4}}}}\,+S{{O}_{3}}\,\,\to \,\,\underset{(\text{Fuming}\,{{H}_{2}}S{{O}_{4}})}{\mathop{\underset{\text{Oleum}}{\mathop{{{H}_{2}}{{S}_{2}}{{O}_{7}}}}\,}}\,\]
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