Which of the following protects life on earth from harmful effects of $UV$ radiations from the sun?

Sulphur dioxide is one of the components of polluted air. $SO_{2}$ is also a major contributor to acid rain. The correct and complete reaction to represent acid rain caused by $SO_{2}$ is ..... .

Smog is primarily caused by the presence of which of the following?

List gases which are responsible for the greenhouse effect.

Which of the following gases causes depletion in the ozone layer?

The reaction that is $NOT$ involved in the ozone layer depletion mechanism in the stratosphere is