Chemistry - Environmental chemistry
Exam Duration: 45 Mins Total Questions : 30
The region of atmosphere nearest to the earth is
- (a)
troposphere
- (b)
stratosphere
- (c)
mesosphere
- (d)
NONE OF THE ABOVE
Which one of the following region contains 80% of the total mass of air and almost all of the water vapours?
- (a)
Stratosphere
- (b)
troposphere
- (c)
mesosphere
- (d)
NONE OF THE ABOVE
Which one of the following is not a particulate pollutant?
- (a)
dust
- (b)
mist
- (c)
smoke
- (d)
CO
CO2 is a natural constituent of the atmosphere and is vital to all forms of plant life. It is present in the atmosphere to the extent of about
- (a)
0.03% by volume of the atmosphere
- (b)
0.01% by volume of the atmosphere
- (c)
0.02% by volume of the atmosphere
- (d)
0.04% by volume of the atmosphere
Government of India announced an action plan called Taj Trapezium to Prevent the disfiguring of the historical monument called 'Taj' as early as in the year
- (a)
1992
- (b)
1993
- (c)
1994
- (d)
1995
Which one of the following is not a viable particulate?
- (a)
Bacteria
- (b)
Fungi
- (c)
Moulds
- (d)
Smogs
Which one of the following reactions is not involved in the formation of photochemical smong?
- (a)
\(NO_{ 2 }\quad (g)\quad \underrightarrow { hv } \quad NO\quad (g)\quad +\quad o(g)\)
- (b)
\(O_{ 3 }\quad (g)\quad \rightarrow \quad O_{ 3 }\quad (g)\quad +\quad O(g)\)
- (c)
\(NO\quad (g)\quad +\quad O_{ 3 }\quad (g)\quad \rightarrow \quad NO_{ 2 }\quad (g)\quad +\quad O_{ 2 }\quad (g)\)
- (d)
\(3CH_{ 4 }\quad +\quad 2O_{ 3 }\quad \rightarrow \quad 3CH_{ 2 }\quad =O\quad +\quad 3H_{ 2 }O\)
The brownish haze of photochemical smog is largely attributed to
- (a)
NO
- (b)
NO2
- (c)
CO
- (d)
SO2
Ozone depletion over Antarctica occurs during
- (a)
spring
- (b)
winter
- (c)
summer
- (d)
rains
Which of the folllowing is not an organic water pollutants?
- (a)
animal waste
- (b)
sewage
- (c)
chemical fertilizers
- (d)
decaying animals
The pH of drinking water should be between
- (a)
9.5 to 10
- (b)
5.5 to 9.5
- (c)
5.5 to 6.25
- (d)
NONE OF THE ABOVE
Bhopal gsd tragedy occured due to leakage of deadly poisonous gas called methyl isocyanate (MIC). It happened on
- (a)
December 2, 1984
- (b)
December 2, 1984
- (c)
December 4, 1984
- (d)
December 4, 1983
Which air pollutant is not released by automobiles?
- (a)
Hydrocarbons
- (b)
Flyash
- (c)
CO
- (d)
SO2
Which of the following gases is not a greenhouse gas?
- (a)
CO
- (b)
O3
- (c)
CH4
- (d)
H2O vapour
Select the wrong statement
- (a)
ozone is not responsible for green house effect
- (b)
ozone hole is thinning of ozone layer present in the stratophere.
- (c)
ozone is produced in upper stratosphere by the action of UV rays on oxygen
- (d)
ozone can oxidise sulphur dioxide present in the atmosphere to sulphur trioxide.
Amount of dissolved oxygen in a water body for healthy aquatic life must be equal to
- (a)
2 ppm
- (b)
5 ppm
- (c)
4 ppm
- (d)
10 ppm
Biochemical oxygen demand, (BOD) is a measure of organic material present in water. BOD value less than 5 ppm indicates a water sample to be
- (a)
rich in dissolved oxygen
- (b)
poor in dissolved oxygen
- (c)
highly polluted
- (d)
not suitable for aquatic life
Sewage containing organic waste should not be disposed in water bodies because it causes major water pollution. Fishes in such a polluted water dies because of
- (a)
large number of mosquitose
- (b)
increase in the amount of dissolved oxygen
- (c)
decrease in the amount of dissolved oxygen in water
- (d)
clogging of gills by mud
Sodium chlorate and sodium arsenite are used as
- (a)
herbicides
- (b)
insecticides
- (c)
fungicides
- (d)
soil conditioners
Major source of water and soil pollution is
- (a)
agro industry
- (b)
thermal power plant
- (c)
mining
- (d)
All of the above
Photochemical smog occurs in warm, dry and sunny climate. Amongst the following one is not the components of photochemical smog, identify it.
- (a)
NO2
- (b)
O3
- (c)
SO2
- (d)
Unsaturated hydroarbon
Which of the following when present in the exhaust gases of the vehicles causes pollution?
- (a)
Water vapours
- (b)
CO2
- (c)
CO
- (d)
C2H6
Organomercury compound are
- (a)
fungicides
- (b)
fumigants
- (c)
herbicides
- (d)
soil conditioners
Green chemistry is the development of
- (a)
process favourable for environment
- (b)
process favourable for aquatic life
- (c)
process used for medical treatment of diseases
- (d)
processes used for growth of green plants and vegetables
Select the incorrect statement
- (a)
Surface water contains a lot of organic matter, mineral nutrients and radioactive materials
- (b)
Oil slick in sea water decreases BOD value
- (c)
Oil spill in sea water causes heavy damage to fishery
- (d)
Main reason for river water pollution is industrial and domestic sewage discharge
As it passes into food chain, the concentration of DDT
- (a)
remains same
- (b)
decreases
- (c)
increases
- (d)
unpredictable
Identify the incorrect statement from the following.
- (a)
oxides of nitrogen in the atmosphere can cause the depletion of ozone layer
- (b)
ozone absorbs the intense ultraviolet radiations of the sun
- (c)
depletion of ozone layer is because of its chemical reactions with chlorofluorocarbons
- (d)
ozone absorbs infrared radiations
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 occurrene of thunderstorm
- (d)
Which depends on the amount of dust in air