Selina solutions concise chemistry class 9 icse Solutions for Chapter 8 chapter 8 atmospheric pollution

Exercises in Chapter 8 chapter 8 atmospheric pollution Grade 9

Exercise 8A

Exercise 8B

Exercise 8C

Exercise 8D

Questions in Exercise 8A

Define the following terms

(i) pollution (ii) pollutant (iii) air pollution.

Name any four gaseous pollutants

Name the compounds of sulfur that cause air pollution. Also, state the harmful effects of sulphur compounds

4. State

i) natural sources of air pollution

ii) man-made sources of air pollution

a)How do the oxides of nitrogen enter the atmosphere?

b) What are their harmful effects?

State the main sources and effects of carbon monoxide

What are the harmful effects of oxides of Sulphur?

Give the mechanism of the action of carbon monoxide

How can we control carbon monoxide poisoning

Questions in Exercise 8B

Why does rainwater have a pH of less than 7?

pH of acid rain is sometimes as low as 2.

Explain the formation of acid rain due to:

1. Oxides of sulphur

2. Oxides of nitrogen

What are the causes of acid rain?

Give the impact of acid rain:

1. on plants

2. on soil

3. on water bodies

How does a scrubber help in reducing the formation of acid rain?

Questions in Exercise 8C

What do you understand by Green House effect?

What are greenhouse gases? How are they responsible for global warming?

State the sources and effects of the following gases:

1. Carbon dioxide

2. Methane

3. Water vapor

State the ways of reducing the presence of greenhouse gases.

State the effects of greenhouse gases on the atmosphere

State the role of a greenhouse in growing plants

Our atmosphere acts as a greenhouse. Explain

How can we reduce global warming?

Questions in Exercise 8D

What is a pollutant?

What is the effect of the following pollutants on living beings (one in each case)?

a. Fluorides

b. Smoke particles

c. Lead

d. Mercury compounds

e. Smog

f. Nitrogen oxide

What is air pollution? How does this pollution take place?

What are the components of clean, dry air?

Name some particulate pollutants

Why is cigarette-smoking harmful

What is smog? State its damaging effects

What do you understand by ppm?

Describe the major air pollutants. How does carbon monoxide pollute our environment?

How do you propose to control:

a. carbon monoxide emission

b. SOx emission

Give the composition, causes, and effects of acid rain

Explain the effect of sulphur dioxide on the atmosphere

Explain the formation of ozone in the atmosphere

What is the function of ozone in the atmosphere?

State the chemicals responsible for ozone layer destruction

Name any two:

a. Natural sources of atmospheric pollution.

b. Gases which are responsible for the formation of acid rain

Explain the term 'global warming'. State two ways by which global warming can be reduced

State two effects of ozone depletion

What is the cause of acid rain? Give any two impacts of acid rain.

Explain the methods of preventing acid rain

State an advantage of CNG (Compressed Natural Gas).

State how CFC breaks the ozone layer.

Describe the methods of saving the ozone layer.

Fill in the blanks:

The pollutants such as NO2, SO2, and SO3 dissolved in the moisture of air are the cause of

____.

Excessive release of carbon dioxide in the atmosphere is the cause of __________ effect which produces

global warming.

The ozone layer prevents the harmful ________ radiation of the sun to reach the earth.

A decrease in the concentration of ozone in the stratosphere is the cause of the formation of __________ holes.

Ozone depletion is mainly caused by the active __________ atoms generated from CFC in the presence of

UV radiation

Select the correct answer:

a) Excessive release of carbon dioxide in the atmosphere is the cause of

i) Depletion of ozone

ii) formation of the polar vortex

iii) global warming

iv) formation of smog

b) Inhalation of air polluted with carbon monoxide is dangerous because:

i) CO combines with O2 dissolved in the blood.

ii) CO combines with hemoglobin of blood.

iii) CO removes water from the body and causes dehydration.

iv) CO causes coagulation of proteins in the body

c) A decrease in the amount of ozone in the stratosphere is called depletion of the zone and it is caused by

i) UV radiations of the sun

ii) Use of CFC compounds

iii) excessive use of detergents

iv) Use of polychlorinated biphenyls

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Chapters in this book

Chapter 1 The Language Of Chemistry

Chapter 2 Chemical Changes And Reaction

Chapter 3 Water

Chapter 4 Atomic Structure And Chemical Bonding

Chapter 5 The Periodic Table

Chapter 6 Study Of The First Element Hydrogen

Chapter 7 Study Of Gas Laws

Chapter 8 Atmospheric Pollution