Question

in which of the following equilibrium moves backward when pressure is applied

Answer 1

Answer:

PCl5⇋PCl3+Cl2

Explanation: The increase of pressure will shift the equilibrium position in the direction of a decrease in the number of moles.

For the reaction PCl5⇋PCl3+Cl2, the forward reaction occurs with an increase in the number of moles from 1 to 2. Also, the reverse reaction occurs with a decrease in the number of moles from 2 to 1.

When the pressure of the system is increased, the backward reaction will be favoured as the reverse reaction occurs with a decrease in the number of moles.