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Question: Answered & Verified by Expert
In which of the following reactions $K_p>K_c$ ?
ChemistryChemical EquilibriumAIIMSAIIMS 2019 (26 May)
Options:
  • A $\mathrm{N}_{2(\mathrm{~g})}+3 \mathrm{H}_{2(\mathrm{~g})} \rightleftharpoons 2 \mathrm{NH}_{3(\mathrm{~g})}$
  • B $\mathrm{H}_{2(g)}+\mathrm{I}_{2(\mathrm{~g})} \rightleftharpoons 2 \mathrm{HI}_{(g)}$
  • C $\mathrm{PCl}_{3(g)}+\mathrm{Cl}_{2(\mathrm{~g})} \rightleftharpoons \mathrm{PCl}_{5(\mathrm{~g})}$
  • D $2 \mathrm{SO}_{3(g)} \rightleftharpoons 2 \mathrm{SO}_{2(g)}+\mathrm{O}_{2(g)}$
Solution:
1961 Upvotes Verified Answer
The correct answer is: $2 \mathrm{SO}_{3(g)} \rightleftharpoons 2 \mathrm{SO}_{2(g)}+\mathrm{O}_{2(g)}$
$\begin{aligned} & \text { When } \Delta n_g>0, K_p>K_c \\ & 2 \mathrm{SO}_{3(g)} \rightleftharpoons 2 \mathrm{SO}_{2(g)}+\mathrm{O}_{2(g)} \\ & \Delta n_g=(2+1)-2=1 \\ & \text { i.e., } \Delta n_g>0\end{aligned}$

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