Among the following, the one which is not a "green house gas" is:

What are the reactions involved for ozone layer depletion in the stratosphere?

Addition of phosphate fertilisers to water bodies causes

Most hazardous metal pollutant of automobile exhaust is

Given below are two statements.
Statement $I:$ In polluted water,values of both dissolved oxygen and $BOD$ are very low.
Statement $II:$ Eutrophication results in a decrease in the amount of dissolved oxygen.
In the light of the above statements,choose the most appropriate answer from the options given below.

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