The ions of $Ni, Hg, Ag, Pb, Zn$ etc.,are generated as waste from which industry?

The irritant red haze in traffic and congested places is due to the presence of which of the following?
$(i)$ Oxides of sulphur
$(ii)$ Oxides of nitrogen
$(iii)$ Carbon dioxide
$(iv)$ Mists,smoke and dust
$(v)$ Smog

State the harmful effects of excessive production of sulfur oxide.

What is the significance of the troposphere for us?

The structure of all living organisms on Earth is known as ............

Arrange the following greenhouse gases in the correct decreasing order of their contribution to global warming.