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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?

  1. Fe
  2. Cr
  3. Cu
  4. 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.

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$\ce{Fe}$ and $\ce{V}$ are used in the contact process. $\ce{Cu}$ is used in the preparation of chlorine gas. Thus $\ce{Cr}$ can be used as a catalyst poison.

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    $\begingroup$ The question specifically asks for more explanation and/or reasons. It is best to avoid writing one line answers in such cases. Please comply by expanding your answer. Kindly also consider good formatting in future posts, it makes them more readable! -From Review $\endgroup$
    – William R. Ebenezer
    Apr 24, 2019 at 16:42

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