Correct Answer: Option B

Explanation

First, calculate the total number of number of moles of gaseous species only, on both sides.

i.e  1 mole on the LHS  while 2 moles on RHS.

An increase in pressure will favour the side with the lesser value of the total number of moles while a decrease in pressure will favour the side with the higher number of moles i.e the RHS. Hence,increasing the yield of PCl\(_3\).

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