NCERT Exercise 6.30 - Equilibrium
Question: For PCl5 ⇌ PCl3 + Cl2 at 473 K, Kc = 8.3 x 10^-3 and delta H degrees = +124 kJ mol^-1, give reverse Kc and effects.
Answer: Kc(reverse) = 120.48. Adding PCl5 or raising temperature shifts forward; raising pressure shifts backward. Kc changes only when temperature changes, and here it increases on heating.
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