A) \[PC{{l}_{3}}\]is added
B) helium gas is added
C) catalyst is added
D) pressure is reduced
Correct Answer: D
Solution :
\[\underset{1\,mole}{\mathop{PC{{l}_{3}}(g)}}\,+\underset{1\,mole}{\mathop{C{{l}_{2}}(g)}}\,\underset{1\,mole}{\mathop{PC{{l}_{5}}(g)}}\,\] In the backward reaction number of moles increases, hence, decreasing pressure will favour the backward reaction.
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