The correct answer is: D. kd & k0 are constant
The rate of a chemical reaction is determined by the rate constant, which is a measure of how fast the reactants are converted into products. The rate constant is dependent on the temperature, the concentration of the reactants, and the activation energy.
In the case of the reaction of NO with I2, the rate constant is given by the following equation:
$$k = k_0 \exp\left(-\frac{E_a}{RT}\right)$$
where $k_0$ is the pre-exponential factor, $E_a$ is the activation energy, $R$ is the gas constant, and $T$ is the temperature.
The pre-exponential factor is a constant that is characteristic of the reaction. It is a measure of the frequency with which the reactant molecules collide with each other with enough energy to react.
The activation energy is the minimum amount of energy that the reactant molecules must have in order to react. It is a measure of the barrier that the reactant molecules must overcome in order to react.
The rate constant is a function of the temperature. The rate constant increases as the temperature increases. This is because the reactant molecules have more energy at higher temperatures, and they are therefore more likely to collide with each other with enough energy to react.
The rate constant is also a function of the concentration of the reactants. The rate constant increases as the concentration of the reactants increases. This is because there are more reactant molecules present at higher concentrations, and they are therefore more likely to collide with each other with enough energy to react.
The rate constant is not a constant. It is a function of the temperature, the concentration of the reactants, and the activation energy.