Class 11 Chemistry Chapter 14 Environmental Chemistry Questions and Answers

Questions

1 Ozone layer that absorbs sun's ultraviolet radiation is present in _______layer of atmosphere.

A Thermosphere

B Mesosphere

C Stratosphere

D Troposphere

View Answer

Answer:Stratosphere

2 The BOD value of clean water is

A < 5 ppm

B < 15 ppm

C > 15 ppm

D > 17 ppm

View Answer

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

View Answer

Answer:CFCs

4 Select the major air pollutant

A CO

B mist

C Hydrogen sulphide

D all

View Answer

Answer:all

5 Methane gas produces by_______ fields.

A Mustard field

B Paddy field

C Wheat field

D Groundnut field

View Answer

Answer:Paddy field

6 Choose the compound that always present in photochemical smog.

A O₃

B CO

C CO₂

D CHO

View Answer

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

View Answer

Answer:Domestic waste and sewage

8 _______ is the uppermost region of the earth atmosphere.

A Stratosphere

B Troposphere

C Exosphere

D Ionosphere

View Answer

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

View Answer

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

View Answer

Answer:Skin cancer

11 Layer that protects us from harmful U.V rays present in____.

A Troposphere

B Stratosphere

C Mesosphere

D Exosphere

View Answer

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

View Answer

Answer:During morning time of winter

13 Particulates matter contains _______.

A Chlorobenzene

B Toluene

C Nitrobenzene

D Polycyclic hydrocarbons

View Answer

Answer:Polycyclic hydrocarbons

14 Cause of Stratosphere’s ozone layer depletion

A CF₂Cl₂

B C₆F1₆

C C₆H₆F₆

D C₆Cl₆

View Answer

Answer:CF₂Cl₂

15 Pollutant _________ forms by burning of fossil fuels.

A Nitrogen dioxide

B Nitric acid

C Nitrous oxide

D Sulphur dioxide

View Answer

Answer:Sulphur dioxide

16 Percentage of CO2 in atmosphere is

A 0.0034

B 0.034

C 34.03

D 3.4

View Answer

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

View Answer

Answer:Minimata disease

18 Summer smog is caused primarily by

A PAN

B CO₂

C Ozone

D NO₂

View Answer

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

View Answer

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

View Answer

Answer:Carbon monoxide-Hb

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