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AIIMS 201926 May
Exam
AIIMS
Year
2019
Date
26 May
Subject
Chemistry
Chapter
Chemical Equilibrium

AIIMS 2019 · 26 May · Chemistry · Chemical Equilibrium

In which of the following reactions K_p>K_c ?

In which of the following reactions Kp>KcK_p>K_c ?

Options

  1. AN2( g)+3H2( g)⇌2NH3( g)\mathrm{N}_{2(\mathrm{~g})}+3 \mathrm{H}_{2(\mathrm{~g})} \rightleftharpoons 2 \mathrm{NH}_{3(\mathrm{~g})}
  2. BH2(g)+\mathrm{H}_{2(g)}+\mathrm{I}2( g)⇌2HI(g)_{2(\mathrm{~g})} \rightleftharpoons 2 \mathrm{HI}_{(g)}
  3. CPCl3(g)+Cl2( g)⇌PCl5( g)\mathrm{PCl}_{3(g)}+\mathrm{Cl}_{2(\mathrm{~g})} \rightleftharpoons \mathrm{PCl}_{5(\mathrm{~g})}
  4. D2SO3(g)⇌2SO2(g)+O2(g)2 \mathrm{SO}_{3(g)} \rightleftharpoons 2 \mathrm{SO}_{2(g)}+\mathrm{O}_{2(g)}

Correct answer

D. 2SO3(g)⇌2SO2(g)+O2(g)2 \mathrm{SO}_{3(g)} \rightleftharpoons 2 \mathrm{SO}_{2(g)}+\mathrm{O}_{2(g)}

Step-by-step solution

 When Δng>0,Kp>Kc2SO3(g)⇌2SO2(g)+O2(g)Δng=(2+1)−2=1 i.e., Δng>0\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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