NCERT Solutions for class 11 Chemistry | Chapter 14 : Environmental Chemistry

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Questions
1 The substance which is a primary pollutant?
A H2SO4
B CO
C PAN
D Aldehydes

Answer:CO
2 Why certain parts of water bodies contain more number of algae?
A Due to favorable environment
B Due to run-off excess fertilizers
C Due to lack of fertilizers
D Due to water pollution

Answer:Due to run-off excess fertilizers
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3 Which of the following is produced by a reaction of ultraviolet light?
A CO2
B SO2
C O3
D NO3

Answer:O3
4 Synthesis of ethanal commercially from which of the following reagent is the part of green chemistry?
A CH3CH2OH
B CH2 = CH2
C HC ≡ CH
D All of these

Answer:CH2 = CH2
5 Identify the wrong statement in the following:
A Acid rain is mostly because of oxides of nitrogen and sulphur
B Chlorofluorocarbons are responsible for ozone layer depltion
C Greenhouse effect is responsible for global warming
D Ozone layer does not permit infrared radiation from the sun to reach the earth.

Answer:Ozone layer does not permit infrared radiation from the sun to reach the earth.
6 Photochemical smog is related to pollution if
A Air
B Water
C Soil
D None of these

Answer:Soil
7 Which of the following is responsible for depletion of ozone layer in the upper strata of the atmosphere?
A Polyhalogens
B Ferrocene
C Fullerencs
D Freons.

Answer:Freons.
8 A disease caused by eating fish contaminated by industrial waste, containing mercury compounds, is called as
A Minamata disease
B Brights disease
C Hashimotos disease
D Osteosclerosis

Answer:Minamata disease
9 The false statement among the followings:
A The average residence time of NO is one month.
B Limestone acts as a sink for SOx.
C SOx can be removed from flue gases by passing through a solution of citrate ions.
D Ammonia acts as a sink for NOx.

Answer:Ammonia acts as a sink for NOx.
10 Which of the following acts as a sink for CO?
A Plants
B Haemoglobin
C Microorganisms present in the soil
D Oceans

Answer:Microorganisms present in the soil
11 What is the indicator of pollution in water?
A Amount of oxygen
B Amount of hydrogen
C Amount of BOD
D Amount of nitrogen

Answer:Amount of BOD
12 One of the following is the chief source of water and soil pollution
A Agro industry
B Mining
C Thermal power stations
D All of these

Answer:Thermal power stations
13 Which is most harmful for life on globe?
A Deforestation
B Soil Erosion
C Increasing Desert
D Nuclear Fallout.

Answer:Nuclear Fallout.
14 Domestic waste mostly constitutes
A Non-biodegradable pollution
B Biodegradable pollution
C Effluents
D Air pollution

Answer:Biodegradable pollution
15 Which of the following acts as a sink for CO?
A Plants
B Haemoglobin
C Microorganisms present in the soil
D Oceans

Answer:Microorganisms present in the soil
16 Photochemical smog is related to pollution if
A Air
B Water
C Soil
D None of these

Answer:Soil
17 Which of the following is responsible for depletion of ozone layer in the upper strata of the atmosphere?
A Polyhalogens
B Ferrocene
C Fullerencs
D Freons

Answer:Freons
18 The most harmful air pollutant produced by automobiles is
A HNO3
B NO
C SO2
D CO

Answer:CO
19 Fluorosis, the bone disease, is caused by the presence of
A Pesticides in water
B Fluorides in water
C Carbon monoxide in air
D Sulphur dioxide in air

Answer:Fluorides in water
20 The agricultural field that produces maximum methane gas into atmosphere is
A Wheat field
B Paddy field
C Cotton field
D Groundnut field

Answer:Cotton field

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