Chemistryhard · Past Paper
In the contact process for making sulfuric acid, what is the catalyst used in the step: $2SO_2 + O_2 \rightleftharpoons 2SO_3$?
AIron
BManganese dioxide
CVanadium pentoxide
DNickel
✓ Correct Answer: C — Vanadium pentoxide
Vanadium pentoxide ($V_2O_5$) is the catalyst used to convert sulfur dioxide to sulfur trioxide efficiently.
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