Explanation
Burning of fossil fuels is the main source of SO2.
Positive soil pollution is reduction in soil productivity due to addition of pesticides, fertilizers and industrial wastes.
CO is a primary pollutant.
CO2 is generally not regarded as a pollutant.
Fly ash are the biggest particulates (diameter about 500,000 nm )
London smog is found in winter during morning time
SO3 is more harmful pollutant than SO2.
Microorganisms present in soil convert CO into CO2
Particulates acquire negative charge and are attracted by the positive electrode.
Depletion of ozone layer over Antarctica takes place during spring.
DDT is non- biodegradable pollutant.
Pesticides cause water pollution.
Decrease in D. O. value due to sewage pollution causes death of fish.
Water is treated with chlorine to kill germs.
In COD determination, the pollutants resistant to microbial oxidation are also oxidised by oxidising agent like K2Cr2O7.
Reaction of methylamine and phosgene to produce MIC (methyl isocyanate) is not an example of green chemistry.
Ozone layer in the upper atmosphere absorbs UV radiations and is beneficial to human life.
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