What happens to the rate of reaction if the pressure of the reacting system increases?
The rate of the reaction increases.
Pressure is one of the factors which affects the rate of the reactions. On increasing the pressure of the gases the molecules come closer which further increases the number of molecules per unit volume. An increase in the number of molecules per unit volume and an increase in their energy will result in an increase in the number of collisions within a specified time. Increase in the number of collisions will result in an increase in the rate of reaction.