Give information on uses of green chemistry in day to day life.
How did the depletion of ozone layer has created in the atmosphere over the Antarctica Explain with reactions.
Give the details of different layer of atmosphere and briefly describe about the substance in it.
What do you mean by green chemistry? How will it help decrease environmental pollution?
Given below are two statements :
Statement $I$ : If $BOD$ is $4\,ppm$ and dissolved oxygen is $8\,ppm$, then it is a good quality water.
Statement $II$ : If the concentration of zinc and nitrate salts are $5 ppm$ each, then it can be a good quality water.
In the light of the above statements, choose the most appropriate answer from the options given below :