Question

In most cases, for a rise of 10K temperature, the rate constant is doubled or tripled. This is due to the reason that ?

• A. Collision frequency increases by a factor 2 to 3
• B. Fraction of molecules possessing threshold energy increases by a factor of 2 to 3
• C. Activation energy is lowered by a factor of 2 to 3
• D. None of these

Answer 1

The correct option is B

Fraction of molecules possessing threshold energy increases by a factor of 2 to 3

For a 10K rise in temperature, collision frequency increases merely by 1 to 2% but the number of effective collisions increases by 100 to 200%.