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

Questions
1 Ozone layer that absorbs sun's ultraviolet radiation is present in _______layer of atmosphere.
A Thermosphere
B Mesosphere
C Stratosphere
D Troposphere

Answer:Stratosphere
2 The BOD value of clean water is
A < 5 ppm
B < 15 ppm
C > 15 ppm
D > 17 ppm

Answer:< 5 ppm

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3 Choose the factor that is responsible for ozone layer depletion.
A CFCs
B CBrCs
C CH2Br2
D all are correct

Answer:CFCs
4 Select the major air pollutant
A CO
B mist
C Hydrogen sulphide
D all

Answer:all
5 Methane gas produces by_______ fields.
A Mustard field
B Paddy field
C Wheat field
D Groundnut field

Answer:Paddy field
6 Choose the compound that always present in photochemical smog.
A O3
B CO
C CO2
D CHO

Answer:O3
7 Bio-degradable pollutant pair is
A Domestic waste and sewage
B DDT and Mercury salt
C Mercury salt and plastic
D Aluminium foil and DDT

Answer:Domestic waste and sewage
8 _______ is the uppermost region of the earth atmosphere.
A Stratosphere
B Troposphere
C Exosphere
D Ionosphere

Answer:Exosphere
9 BOD5 means
A Waste decomposed in 5 days
B Oxygen consumed in 5 days
C Microorganisms killed after 5 days
D Amount of dissolved oxygen left after after 5 days

Answer:Oxygen consumed in 5 days
10 Which is the resulting disease due to depletion of ozone layer.
A Thyroid cancer
B Pulmonary cancer
C Skin cancer
D Breast cancer

Answer:Skin cancer
11 Layer that protects us from harmful U.V rays present in____.
A Troposphere
B Stratosphere
C Mesosphere
D Exosphere

Answer:Stratosphere
12 We can see London smog in
A During day time of summer
B During morning time of summer
C During morning time of winter
D During day time of Winter

Answer:During morning time of winter
13 Particulates matter contains _______.
A Chlorobenzene
B Toluene
C Nitrobenzene
D Polycyclic hydrocarbons

Answer:Polycyclic hydrocarbons
14 Cause of Stratosphere’s ozone layer depletion
A CF2Cl2
B C6F16
C C6H6F6
D C6Cl6

Answer:CF2Cl2
15 Pollutant _________ forms by burning of fossil fuels.
A Nitrogen dioxide
B Nitric acid
C Nitrous oxide
D Sulphur dioxide

Answer:Sulphur dioxide
16 Percentage of CO2 in atmosphere is
A 0.0034
B 0.034
C 34.03
D 3.4

Answer:0.034
17 The disease that occurs due to eating high Hg content fish.
A Minimata disease
B Beri-beri disorder
C kwashiorkar disese
D Osteosclerosis

Answer:Minimata disease
18 Summer smog is caused primarily by
A PAN
B CO2
C Ozone
D NO2

Answer:NO2
19 Threat to Agra’s historical monument.
A Hard water of Yamuna river
B Temperature mediated spoilage of marble
C Air pollutants from Mathura refinery
D Weathering of marble

Answer:Air pollutants from Mathura refinery
20 Choose the compound that produce toxic effect.
A Carbon dioxide-Hb
B Carbon monoxide-Hb
C Oxygen-Hb
D Carbon suboxide-Hb

Answer:Carbon monoxide-Hb

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