For the reaction taking place in the presence of sunlight,the order of reaction is
$H_2 + Cl_2 \xrightarrow{\text{Sunlight}} 2HCl$

The law of photochemical equivalence was given by

According to the law of photochemical equivalence,the energy absorbed (in $ergs \ mol^{-1}$) is given as ($h = 6.62 \times 10^{-27} \ erg \ s$,$c = 3 \times 10^{10} \ cm \ s^{-1}$,$N_A = 6.02 \times 10^{23} \ mol^{-1}$):

For a photochemical reaction,if the intensity of absorbed light is $I$ and the concentration of $AB$ is $C$. Given the reaction $AB + h\nu \rightarrow AB^*$,the rate of formation of $AB^*$ is proportional to:

Which of the following is true for a photochemical reaction?

Silver nitrate is usually kept in coloured bottles because it is