Chemistry Reaction Kinetics MDCAT 2011
PMDC Verified Question 77 of 80
According to the collision theory of bimolecular reactions in gas phase, minimum amount of energy required for an effective collision is known as:
A
Rate of reaction
B
Energy of activation
C
Heat of reaction
D
Has no effect on the reaction
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Energy of activation
Concept:

Not all collisions between reactant molecules lead to product formation. Only those possessing a specific minimum kinetic energy are effective.

Formula:

$$ E \geq E_a \text{ (for effective collision)} $$

Solution:

  • This required threshold energy is formally defined as the Energy of Activation (\( E_a \)).
  • It is the minimum extra amount of energy (above the average kinetic energy) that reactants must possess to convert into products.


Why other options are incorrect:

Heat of reaction (\( \Delta H \)) is the energy difference between products and reactants. Rate of reaction is a speed, not an energy measure.

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