Question

Minimum amount of energy that the colliding reactant molecule must possess for the chemical reaction to occur is called

• A. Activation energy
• B. Threshold energy
• C. Enthalpy change of reaction
• D. None of the above

Answer 1

The correct option is B Threshold energy

Threshold energy:
The minimum energy which the colliding molecules must possess for the chemical reaction to occur is known as threshold energy.

Activation energy:
The extra energy required by a reactant to participate in a reaction is called activation energy.


$E_T=E_a+\text{Energy of reactant molecule}$
where,
$E_T$ is Threshold energy
$E_a$ is Activation energy