The main cause of air pollution in large cities is ........

Methane gas has a global warming potential approximately $25$ times that of which of the following gases?

The incorrect statement$(s)$ among $(a) - (d)$ regarding acid rain is (are) :
$(a)$ It can corrode water pipes.
$(b)$ It can damage structures made up of stone.
$(c)$ It cannot cause respiratory ailments in animals.
$(d)$ It is not harmful for trees.

Which of the following statements is $NOT$ true according to the principles of green chemistry?

The ozone layer forms naturally by

The correct sequence of atmospheric layers starting from the Earth is: