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Which of the following industrial process-reaction pairs is correctly described?

1. Ostwald process: 4NH3 + 5O2 --[Pt/Rh, 500 K, 9 bar]--> 4NO + 6H2O
2. Contact process: S + O2 -> SO2; 2SO2 + O2 --[V2O5]--> 2SO3
3. Deacon's process: 4HCl + O2 --[CuCl2, 723 K]--> 2Cl2 + 2H2O
4. Haber's process: N2(g) + 3H2(g) ⇌ 2NH3(g); uses Fe/FeO catalyst and K2O/Al2O3 promoters; Mo used as promoter.

Correct answer: Ostwald process: 4NH3 + 5O2 --[Pt/Rh, 500 K, 9 bar]--> 4NO + 6H2O

Solution

Option A (Ostwald process) is correctly stated. Option B's stoichiometry in original was written as SO2 + 1/2 O2 which is correct but the option as written with coefficient check: 2SO2 + O2 -> 2SO3 is also correct. Option C is correct for Deacon's. Option D has an error: Mo is not used in Haber's process. Thus A, B, C are correct while D is wrong.

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