With an increase in temperature,the rate constant $k$:

For a reaction $E_a = 0$ and $k = 3.2 \times 10^8 \ s^{-1}$ at $300 \ K$. The value of frequency factor at $400 \ K$ would be

$A$ rise in temperature increases the velocity of a reaction. It is because it results in

All energetically effective collisions do not result in a chemical change. Explain with the help of an example.

In a reaction, for every $10^{\circ} C$ rise of temperature, the rate is doubled. If the temperature is increased from $10^{\circ} C$ to $100^{\circ} C$, the rate of the reaction will become $:-$ (in $times$)

Define the following terms:
$(1)$ Fraction of molecules
$(2)$ Frequency factor