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121.
In Antarctica ozone depletion is due to the formation of following compound
A
acrolein
B
peroxyacetyl nitrate
C
$$S{O_2}$$ and $$S{O_3}$$
D
chlorine nitrate
Answer :
acrolein
In antarctica, ozone depletion is due to formation of acrolein.
122.
Green house gases can be arranged in ‘Global Warming Potential’ sequence as
A
$${N_2}O > CFC > C{H_4} > C{O_2}$$
B
$$CFC > {N_2}O > C{H_4} > C{O_2}$$
C
$$CFC > C{O_2} > {N_2}O > C{H_4}$$
D
$$C{O_2} > CFC > {N_2}O > C{H_4}$$
Answer :
$$CFC > {N_2}O > C{H_4} > C{O_2}$$
$$CFC > {N_2}O > C{H_4} > C{O_2}$$
123.
Mark the correct statement.
A
Photochemical smog occurs in day time while the classicalsmog occurs in earlymorning hours.
B
Acid rain damages the buildings while it is not toxic to vegetation and aquatic life.
C
Carbon monoxide is a greenhouse gas which results in global warming.
D
Smoke consists of fine particles produced during crushing and grinding ofsolid materials.
Answer :
Photochemical smog occurs in day time while the classicalsmog occurs in earlymorning hours.
No explanation is given for this question. Let's discuss the answer together.
124.
Which of the following statements about photochemical smog is not correct?
A
It occurs in warm, dry and sunny climate.
B
Chemically, it is a reducing mixture and is called reducing smog.
C
It is formed as a result of action of sunlight on unsaturated hydrocarbons and nitrogen oxides.
D
It has high concentration of oxidising agents and is also called oxidising smog.
Answer :
Chemically, it is a reducing mixture and is called reducing smog.
Classical smog is a reducing smog.
125.
Sewage containing organic waste should not be disposed in water bodies because it causes major water pollution. Fish 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
Answer :
decrease in the amount of dissolved oxygen in water
If the concentration of dissolved oxygen in water is below $$6ppm,$$ the growth of fish gets inhibited.
126.
Consider the following statements regarding compounds which cause global warming. $$'X'$$ is a hydrocarbon, $$'A'$$ and $$'B'$$ are neutral oxides of nitrogen, $$'C'$$ is a blue coloured gas and $$'D'$$ is released when $${H_2}S$$ is reacted with oxygen. Identify the correct statements about $$X, A, B, C$$ and $$D.$$
(i) $$'X'$$ is mainly present in natural gas.
(ii) In $$A$$ and $$B$$ one is diamagnetic and another one is paramagnetic.
(iii) $$'C'$$ can be identified by using liquid element in $$d$$ - block.
(iv) $$'D'$$ causes acid rain.
A
All are correct
B
(i), (ii), (iii)
C
(ii), (iii), (iv)
D
(i), (iii), (iv)
Answer :
All are correct
$$X:C{H_4},A$$ and $$B:NO$$ and $$N{O_2},C:{O_3},D:S{O_2}$$
127.
$$S{O_2}$$ and $$N{O_2}$$ cause pollution by increasing
A
acidity
B
alkalinity
C
buffer action
D
none of these
Answer :
acidity
Oxides of sulphur and nitrogen combines with moisture in atmosphere to form acids.
128.
Ozone hole refers to
A
increase in concentration of ozone.
B
hole in ozone layer.
C
reduction in thickness of ozone layer in troposphere.
D
reduction in thickness of ozone layer in stratsophere.
Answer :
reduction in thickness of ozone layer in stratsophere.
Ozone hole is reduction in ozone layer in stratosphere.