A \( 2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g) \)
B \( N_2(g) + O_2(g) \rightleftharpoons 2NO(g) \)
C \( N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3 \)
D \( PCl_3(g) + Cl_2(g) \rightleftharpoons PCl_5(g) \)
Correct Answer: Option D
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