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Question

Oleum is

A
castor oil
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B
oil of vitriol
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C
fuming H2SO4
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D
none of these.
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Solution

The correct option is C fuming H2SO4
Pyrosulphuric acid or oleum (+6) is H2S2O7 which is obtained by dissolving SO3 and is called fuming sulphuric acid.

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