Distinguishing Haber and Contact processes

Steps:

• Haber process raw materials: N2 from fractional distillation of air, H2 from natural gas; Contact: SO2 from sulfur, O2 from direct air (no distillation needed).
• Catalysts: Haber uses iron; Contact uses vanadium(V) oxide—both employ catalysts.
• Products of catalyzed reactions: Haber yields NH3 (N H3, type X Y3); Contact yields SO3 (S O3, type X Y3).
• Valid statements: 1 (only Haber uses distilled air product) and 3 (both products X Y3); 2 false.

Why B is correct:

• B selects statements 1 and 3, matching process definitions where only Haber requires air distillation for N2 and both yield X Y3 products.

Why the others are wrong:

• A includes false statement 2 (both use catalysts).
• C picks only false statement 2.
• D omits true statement 1.

Final answer: B