Question

Threshold energy is equal to

• A. Activation energy
• B. Activation energy – energy of molecules
• C. Activation energy + energy of molecules
• D. None of these

Answer 1

Answer: (C)

Activation energy + energy of molecules

Answer 2

According to the collision theory, only a small fraction of collision is effective in bringing about the chemical reaction and the rest of the collisions are ineffective. For effective collision (to yield product) the colliding molecules must have more than or equal to certain minimum amount of energy called threshold energy.

Threshold energy = Activation energy + Average kinetic energy of the molecules.