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Which catalyst is used to prepare SO3 from SO2 in contact process of production of H2SO4 ?

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Which catalyst is used to prepare SO3 from SO2 in contact process of production of H2SO4 ? 

(A) NO 

(B) V2O5 

(C) Fe 

(D) Ni

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V2O5 is used to prepare SO3 from SO2 in contact process of production of H2SO4 .

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