CBSE Class 11 Chemistry HOTs Environmental Chemistry

Question. In Antarctica, ozone depletion is due to the formation of following compound
(a) acrolein
(b) peroxyacetyl nitrate
(c) SO₂ and SO₃
(d) chlorine nitrate
Answer : A

Question. CFC which is a main reason behind air pollution, is produced by
(a) sewage pollutant
(b) aerosols
(c) industrial remains
(d) all the these
Answer : B

Question. Which is a dangerous radiological pollutant?
(a) C¹⁴
(b) S³⁵
(c) Sr⁹⁰
(d) P³²
Answer : C

Question. Formation of London smog takes place in
(a) winter during day time
(b) summer during day time
(c) summer during morning time
(d) winter during morning time
Answer : D

Question. Classical smog occurs in places of
(a) excess SO₂
(b) low temperature
(c) high temperature
(d) excess NH₃
Answer : B

Question. Which of the following is the coldest region of atmosphere?
(a) Thermosphere
(b) Mesosphere
(c) Troposphere
(d) Stratosphere
Answer : B

Question. Green house gases –
(a) allow shorter wavelength to enter earth's atmosphere while doesn't allow longer wavelength to leave the earth's atmosphere.
(b) allow longer wavelength to enter earth atmosphere while doesn't allow shorter wavelength to leave the surface
(c) don't have wavelength specific behaviour. (d) show wavelength specific behaviour near the earth while far from earth these have
wavelength independent behaviour.
Answer : A

Question. The quantity of DDT in food chain
(a) decreases
(b) remains same
(c) increases
(d) changes
Answer : C

Question. Which gas is responsible for ‘ Bhopal Gas Tragedy’ in 1984?
(a) C O
(b) Methyl isocyanate
(c) SO₂ and NO₂
(d) Ethyl isocyanate
Answer : B

Question. Minamata disease is a pollution related disease results from
(a) oil spills into sea
(b) accumulation of arsenic into atmosphere
(c) release of industrial waste mercury into water bodies
(d) release human organic waste into drinking water
Answer : C

Question. Negative soil pollution is
(a) reduction in soil productivity due to erosion and over use
(b) reduction in soil productivity due to addition of pesticides and industrial wastes
(c) converting fertile land into barren land by dumping ash, sludge and garbage
(d) None of the above
Answer : A

Question. Lichens do not like to grow in cities
(a) because of absence of the right type of algae and fungi
(b) because of lack of moisture
(c) because of SO₂ pollution
(d) because natural habitat is missing
Answer : C

Question. Which causes death of fish in water bodies polluted by sewage?
(a) Foul smell
(b) Pathogens
(c) Herbicides
(d) Decrease in D.O.
Answer : D

Question. Which of the following statement is false ?
(a) The average residence time of NO is one month
(b) Limestone acts as a sink for SO_x
(c) SO_x can be removed from fuel gases by passing through a solution of citrate ions
(d) Ammonia acts as a sink for NO_x
Answer : A

Question. When rain is accompanied by a thunderstorm, the collected rain water will have a pH value 
(a) slightly lower than that of rain water without thunderstorm
(b) slightly higher than that when the thunderstorm is not there
(c) uninfluenced by occurrence of thunderstorm
(d) which depends upon the amount of dust in air
Answer : A