JEE Questions for Chemistry Environmental Chemistry Quiz 3 - MCQExams.com

Burning of fossil fuels is the main source of which of the following pollutants?
  • Nitric oxide
  • Carbon monoxide
  • Sulphur dioxide
  • Particulate matter
Positive soil pollution is
  • Reduction in soil productivity due to addition of pesticides, fertilizers and industrial wastes
  • Reduction in soil productivity due to erosion and over use
  • Converting fertile land into barren land by dumping ash, garbage and rubbish
  • None of these
Identify the incorrect statement from the following.
  • Oxides of nitrogen in the atmosphere can cause the depletion of ozone layer
  • Ozone absorbs the intense ultraviolet radiations of the sun
  • Depletion of ozone layer is because of its chemical reactions with chlorofluoroalkanes
  • Ozone absorbs infrared radiations
Pick out the correct statement
  • CO which is major pollutant resulting from the combustion of fuels in automobiles plays a major role in photochemical smog
  • Classical smog has an oxidising character while the photochemical smog is reducing in character
  • Photochemical smog occurs in day time whereas the classical smog occurs in early morning hours
  • During formation of smog the level of ozone in the atmosphere goes down
  • Classical smog is good for health but not photochemical smog
Which of the following is a primary pollutant?
  • CO
  • PAN
  • Aldehydes
  • H2SO4
Which of the following is not regarded as a pollutant?
  • NO2
  • CO2
  • O3
  • Hydrocarbons
Which of the following is the biggest particulate matter?
  • Soot
  • H2SO4 droplets
  • Fly ash
  • HNO3 droplets
London smog is found in
  • Summer during day time
  • Summer during morning time
  • Winter during morning time
  • Winter during day time
Which of the following statement is true ?
  • SO3 is more harmful air pollutant than SO2
  • SO2 doesnot affect larynx (voice box)
  • NO is more toxic to living tissues than NO2
  • NOx does not play any role in photochemical smog
Which of the following is a sink for CO?
  • Haemoglobin
  • Microorganisms present in the soil
  • Oceans
  • Plants
Which of the following statements about control of particulate pollution is not correct?
  • Gravity settling chamber removes larger particles from the air
  • Cyclone collector removes fine particles in the diameter range 5-20 microns
  • Wet scrubbers are used to wash away all types of particulates
  • In electrostatic precipitator, the particulates are made to acquire positive charge which are then attracted by the negative electrode and removed
Chlorofluorocarbon releases which of the following chemical harmful to ozone ?
  • Fluorine
  • Chlorine
  • Nitrogen dioxide
  • Sulphur dioxide
Depletion of ozone layer over Antarctica takes place during
  • Spring (in the months of September and October)
  • November i.e. after spring
  • Winter
  • Summer
DDT is
  • A fertilizer
  • Biodegradable pollutant
  • Non-biodegradable pollutant
  • Greenhouse gas
Which of the following causes water pollution?
  • Fly ash
  • Auto exhausts
  • Aeroplanes
  • Pesticides
Fish die in water bodies polluted by sewage due to
  • Pathogens
  • Clogging of gills by silt
  • Decrease in D.O.
  • Foul smell
Water is often treated with chlorine to
  • Increase oxygen content
  • Kill germs
  • Remove suspended particles
  • Remove hardness
Which of the following statements is false ?
  • The lower the concentration of D.O., the more polluted is the water sample.
  • The tolerable limit of lead in drinking water is 50 ppm
  • Water is considered pure if it has BOD less than 5 ppm
  • In COD determination, the pollutants resistant to microbial oxidation are not oxidised by oxidising agent like K2Cr2O7
Which of the following is not an example of green chemistry?
  • Catalytic dehydrogenation of the diethanolamine without using cyanide and formaldehyde
  • Replacement of CFCs by CO2 as blowing agent in the manufacture of polystyrene foam sheets
  • Reacting methylamine and phosgene to produce methyl isocyanate
  • Replacement of organotins by ‘sea-nine’ as antifouling compound in sea marines
Which of the following statement is true about ozone layer?
  • It is harmful because ozone is dangerous to living organism
  • It is beneficial because oxidation reaction can proceed faster in the presence of ozone
  • It is beneficial because ozone cuts-off the ultraviolet radiation of the sun
  • It is harmful because ozone cuts out the important radiation of the sun which are vital for photosynthesis
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