What happens as the activation energy increases?
a. the pressure of the system decreases.
b. the kinetic energy of colliding molecules changes.
c. the reactant surface area decreases.
d. the reaction begins to slow down.

The relation between activation energy, temperature and rate constant (which gives speed of reaction) was proposed by Arrhenius and the mathematical form is

Where

A = arrhenius or frequency or collision factor

T = temperature

Ea = activation energy

K = rate constant

So if we are increasing activation energy there must be some change in temperature of the systme and this will bring changes in kinetic energy of colliding molecules

Thus answer is

B. The kinetic energy of colliding molecules changes.

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