The rate of the reaction is the speed of the reaction occurring in a system. The concentration of the reaction mixture increases the reaction rate. Thus, option D is correct.
What factors affect reaction rate?
The reaction rate is affected by various factors that increase or decrease the rate of the reaction mixture to react and yield the products. Increasing the surface area of the reaction mixture increases the rate of the reaction.
The addition of an inhibitor decreases the rate and an increase in concentration increase the rate as the concentration increases the particle involved in the reaction hence the collision leading to the reaction rate increases.
Therefore, option D. concentration increases the rate of reaction by increasing the collision rate.
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