A) \[{{H}_{2}}S{{O}_{4}}\] (conc.)
B) \[{{H}_{2}}S{{O}_{4}}\] (dil.)
C) \[{{H}_{2}}S{{O}_{4}}\]
D) \[{{H}_{2}}{{S}_{2}}{{O}_{7}}\]
Correct Answer: D
Solution :
\[{{H}_{2}}S{{O}_{4}}+S{{O}_{3}}\,\to \,\underset{(\text{oleum})}{\mathop{{{H}_{2}}{{S}_{2}}{{O}_{7}}}}\,\]
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