For the reaction pcl5(g) + heat pcl3(g) + cl2(g), what will happen when the pressure is increased?

Reaction: PCl₅ + Heat ↔ PCl₃ + Cl₂

Here, The reaction is in equilibrium, so when you increase the pressure, system will try to decrease it, Since the forward reaction results in the increase of gaseous pressure, so the equilibrium will shift towards the "LEFT"

Hope this helps!

D)can be increased in a closed system