Q63 / 180 · AIIMS 2019 (26 May) · Chemistry

In which of the following reactions $K_p>K_c$ ?

  • 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
    $\mathrm{PCl}_{3(g)}+\mathrm{Cl}_{2(\mathrm{~g})} \rightleftharpoons \mathrm{PCl}_{5(\mathrm{~g})}$
  • Correct answer
    D
    $2 \mathrm{SO}_{3(g)} \rightleftharpoons 2 \mathrm{SO}_{2(g)}+\mathrm{O}_{2(g)}$

Solution

$\begin{aligned} & \text { When } \Delta n_g>0, K_p>K_c \\ & 2 \mathrm{SO}_{3(g)} \rightleftharpoons 2 \mathrm{SO}_{2(g)}+\mathrm{O}_{2(g)} \\ & \Delta n_g=(2+1)-2=1 \\ & \text { i.e., } \Delta n_g>0\end{aligned}$

Hence, the correct answer is option: 'D'.

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