I came across a question that goes as:
In manufacturing of sulfuric acid in presence of platinum catalyst, which metal impurity acts as a catalytic poison?
- Fe
- Cr
- Cu
- V
I searched everywhere I could but did not find anything that talks about this. I read about $\ce{As2O3}$ being a catalytic poison in this reaction and recommendations for using the Contact process using $\ce{V2O5}$ instead of this reaction.
I can understand that this is more of a fact based question but reasons or explanation (if any) should please be included.