JUPEBChemistryChemical Equilibrium

In the Contact process for manufacturing sulphuric acid, the conditions used for the reaction 2SO$_2$ + O$_2$ ⇌ 2SO$_3$ are

A450 °C, about 2 atm, vanadium(V) oxide catalyst.CORRECT
B1000 °C, 2 atm, nickel catalyst.
C450 °C, 200 atm, iron catalyst.
D25 °C, 1 atm, platinum catalyst.
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Toaster Teacher
Why the answer is A, and why the others tempt you.
A moderate temperature of about 450 °C balances a reasonable rate against the yield of the exothermic reaction, a pressure only slightly above atmospheric is sufficient because the yield is already high, and V$_2$O$_5$ is the catalyst. Iron at 200 atm are the conditions of the Haber process for ammonia.
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