Oleum is (a) castor Oil (b) oil of vitriol
Oleum is
(a) castor Oil (b) oil of vitriol (c) fuming H2SO4 (d) None of them
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(c) Oleum is H2S2O7 (H2SO4 + SO3 ) which is obtained by dissolving SO3 in H2SO4 and is called fuming sulphuric acid
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