Environmental Chemistry MCQ's for NEET
1. Which of the following gases is not a green house gas
(a) CO
(b) CH₂
(c) 03
(d) H₂O vapours
2. Photochemical smog occurs in warm, dry and sunny climate. One of the following is not amongst the components of photochemical smog, identify it.
(a) NO₂
(b) 03
(c) SO₂
(d) Unsaturated hydrocarbons.
3. Which of the following statements is not true about classical smog ?
(a) Its main components are produced by the action of sunlight on emissions of automobilies and factories.
(b) It is produced in cold and humid climate.
(c) It contains compounds of reducing nature.
(d) it contains smoke, fog and sulphur dioxide.
4. Biochemical Oxygen Demand (BOD) is a measure of organic material present in water, BOD value less than 5 ppm indqicates a water sample to be
(a) rich in dissolved oxygen,
(b) poor in dissolved oxygen.
(c) highly polluted.
(d) not suitable for aquatic life.
5. Which of the following statements is wrong?
(a) Ozone is not responsible for green house effect.
(b) Ozone can oxidise sulphur dioxide present in the atmosphere to sulphur trioxide.
(c) Ozone hole is thinning of ozone layer present in stratosphere.
(d) Ozone is produced in upper stratosphere by the action of UV rays on oxygen.
6. Sewage containing organic waste should not be disposed in water bodies because it causes major water pollution, Fishes in such a polluted water die because of
(a) Large number of mosquitoes.
(b) Increase in the amount of dissolved oxygen.
(c) Decrease in the amount of dissolved oxygen in water.
(d) Clogging of gills by mud.
7. Which of the following statements about photochemical smog is wrong?
(a) It has high concAentration of oxidising agents.
(b) It has low concentration of oxidising agent.
(c) It can be controlled by controlling the release of NO₂, hydrocarbons, ozone etc.
(d) Plantation of some plants like pinus helps in controlling photochemical smog.
8. The gaseous envelope around the earth is known as atmosphere. The lowest layer of this is extended upto 10 km from sea level, this layer is.
(a) Stratosphere
(b) Troposphere
(c) Mesosphere
(d) Hydrosphere
9. Dinitrogen and dioxygen are main constituents of air but these do not react with each other to form oxides of nitrogen because.
(a) the reaction is endothermic and requires very high temperature.
(b) the reaction can be initiated only in presence of a catalyst.
(c) oxides of nitrogen are unstable.
(d) N₂ and O₂ are unreactive.
10. The pollutants which come directly in the air from sources are called primary pollutants. Primary pollutants are sometimes converted into secondary pollutants. Which of the following belongs to secondary air pollutants ?
(a) CO
(b) Hydrocarbon
(c) Peroxyacetyl nitrate
(d) NO
11. Which of the following statements is correct?
(a) Ozone hole is a hole formed in stratosphere from which ozone oozes out.
(b) Ozone hole is a hole formed in the troposphere from which ozone oozes out.
(0) Ozone hole is thinning of ozone layer of stratosphere
at some places.
(d) Ozone hole means vanishing of ozone layer around the earth completely.
12. Which of the following practices will not come under green chemistry?
(a) if possible, making use of soap made of vegetable oils instead of using synthetic detergents.
(b) Using H₂O₂ for bleaching purpose instead of using chlorine based bleaching agents
(c) Using bicycle for travelling small distances instead of using petrol/diesel based vehicles:
(d) Using plastic cans for neatly storing substances.
13.The gas which reacts with haemoglobin in blood is
(a) CO
(b) SO₂
(c) CO₂
(d) NO.
14.Ozone is present in:
(a) Thermosphere
(b) Mesosphere
(c) Stratosphere
(d) Troposphere.
15.Water pollution is less if BOD is
(a) less than 5 ppm
(b) less than 15 ppm
(c) less than 50 ppm
(d) less than 100 ppm.
16.Which is responsible mainly for depletion of ozone layer ?
(a) CFCS
(b) HCFS
(c) CH,Br
(d) all are correct.
17. The major air pollutant is:
(a) CO
(b) Oxides of nitrogen
(c) Oxides of sulphur
(d) all.
18.The pollutant released in Bhopal gas tragedy was:
(a) Ammonia
(b) Methyl isocyanate
(c) Mustard gas
(d) Nitrous oxide.
19.Besides CO₂, the other green house gas is
(a) CH4
(b) N₂
(c) Ar
(d) 0₂.
20.Which oxide of nitrogen is not common pollutant ?
(a) NO₂
(b) N₂O5
(c) NO
(d) N20
21.Acid rain is due to
(a) formation of oxides of sulphur
(b) formation of oxides of nitrogen
(c) formation of H₂SO4 and HNO3
(d) All of these.
22A. BOD is a measure of
(a) Organic pollutant in water
(b) Oxides of SPN in air
(c) Inorganic pollutant in water
(d) Particle matter in water. 11. Which is not a source of pollution ?
(a) Forest fire
(b) Coal fire
(c) Volcanoes
(d) Dust storm.
23.Which of the following will increase the BOD of water supply ?
(a) CO₂
(b) H₂O
(c) O3
(d) C₂H₂OH.
24. A considerable part of the harmful UV, radiation of the sun does not reach the surface of earth because above the earth's atmosphere, there is a layer of
(a) CO₂
(b) O3
(c) N₂
(d) O2
25. Which of the following proceses does not increase the amount of CO₂ in atmosphere ?
(a) Decay of animals
(b) Breathing
(c) Photosynthesis
(d) Burning of petrol.
26. Which of the following is not a vehicular pollutant ?
(a) Co
(b) NO₂
(c) Particulate matter
(d) Hydrocarbons.
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