Chemistry 9701 · AS & A Level · Chemistry of transition elements

Chemistry of transition elements — practice question

Transition elements and their compounds are commonly used as catalysts. What is the identity of, and what is the oxidation number of, the element contained in the catalyst used in the Contact process?

Airon, $0$
Biron, $+3$
Cvanadium, $0$
Dvanadium, $+5$

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