Identify the correct formula of oleum from the following :
A
H2S2O7
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B
H2SO3
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C
H2SO4
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D
H2S2O8
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Solution
The correct option is AH2S2O7 The correct formula of oleum is H2S2O7. Pyrosulphuric acid or oleum (+6) is H2S2O7 which is obtained by dissolving SO3 and is called fuming sulphuric acid.