In order for the level of ozone to be maintained in dynamic equilibrium, the rate at which ozone-depleting processes occur must be 1. greater than the rate at which ozone is formed. 2. cannot be determined 3. equal to zero. 4. equal to the rate at which ozone is formed. 5. less than the rate at which ozone is formed.

4. equal to the rate at which ozone is formed.

Explanation:

Characteristics of chemical equilibrium:

1. Chemical equilibrium are attained is closed system.

2. The macroscopic remains constant like: volume, pressure, energy etc.

3. The equilibrium is dynamic in nature and the reactions are continuous in nature. Rate of forward reaction is equal to the rate of backward reaction.

4. The concentration of the reactants and products remain constant.They are not always equal.

rate of decomposition of ozone = rate of formation of ozone

when it is at an intermediate population density