Answer:
Explanation;
For a reaction to take place. A collision must occur. Although several collisions can occur, only collisions with kinetic energy greater than or equal to activation energy can lead to a reaction. This is termed an effective collision
By increasing the surface area, more particles are exposed and can undergo collision for a reaction to take place. Hence, when the surface area is increased, there is an increase in the particle surface that can collide which can lead to an effective collision that results in a chemical reaction