Which of the following reversible reactions can be pushed towards the products' side by reducing pressure?

1. PCl_3(g) + Cl_2(g) ⇌ PCl_5(g)
2. CaCO_3(s) ⇌ CaO_(s) + CO_2(g)
3. N_2(g) + 3 H_2(g) ⇌ 2 NH_3(g)
4. CH_4(g) + H₂O_(g) ⇌ CO_(g) + 3 H_2(g)
5. 2 SO_2(g) + O_2(g) ⇌ 2 SO_3(g)

• A. 1 and 2
• B. 1 and 3
• C. 3 and 4
• D. 2 and 4
• E. 3 and 5
• F. 1 and 4
• G. 4 and 5
• H. 2 and 5

Answer: (D)