Question

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

• A. collision frequency increases by a factor of $2$ 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 $3$

In most cases, for a rise of $10K$ temperature the rate constant is doubled to tripled. This is due to the reason that 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 $200$%.