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What is the formula of oleum, formed when SO3 is absorbed in concentrated H2SO4?
AH2S2O7
BH2S4O6
CH2S2O3
DH2SO3
Answer & Solution
Correct answer: A. H2S2O7
SO3 absorbed in sulfuric acid gives pyrosulfuric acid, H2S2O7, also called fuming sulfuric acid.
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