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Which one is known as the oil of vitriol? 

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Which one is known as the oil of vitriol? 

(a) H2SO 

(b) H2SO4 

(c) H2S2O 

(d) H2S2O

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(b) H2SO4 

Sulfuric acid whose chemical formula is H2SO4 is called as "Oil of vitriol" by medieval Europen chemists because it was prepared by roasting "green vitriol" (iron (II) sulfate i.e. FeSO4) in an iron container.

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