Viraf J. Dalal solutions for Simplified ICSE Chemistry [English] Class 9 chapter 8 - Atmospheric Pollution [Latest edition]

Name any two:

Natural sources of atmospheric pollution.

Name any two:

Gases that are responsible for the formation of acid rain. 

What is meant by the term ‘acid rain’. Give any two impacts of acid rain.

State an advantage of using solar energy.

Explain the methods of preventing acid rain.

State how CFCs break ozone in the stratosphere.

State what is meant by the term ‘atmospheric pollution’. Name four gaseous atmospheric pollutants.

What is acid rain?

State the two forms of deposition of acid rain with suitable examples of each form of deposition.

State the natural and man-made sources of the two pollutants responsible for acid rain.

Burning of fossil fuels is an important source of the pollutant – ‘oxides of sulphur’ responsible for acid rain.
State what are ‘fossil fuels’. Name the principal fossil fuels. State why sulphur dioxide is emitted on burning a fossil fuel. Give a balanced equation for the same.

During metallurgy – smelting plants produce sulphur dioxide, when metallic sulphides are roasted in air. Give a balanced equation for the same.

State why high temperatures in internal combustion engines release pollutant – oxides of nitrogen.

State why natural rain water produced in an unpolluted atmosphere is slightly acidic. Give a balanced equation of the same.

Give balanced equations for the formation of sulphuric acid in acid rain, when’ a fossil fuel is burnt in an electric power station.

Starting from nitrogen in air, enlist the reactions with the help of balanced equations, which result in the conversion of nitrogen in an internal combustion- engine, to the acids formed which are responsible for acid rain.

Explain the basic function of a catalytic converter in an internal combustion engine.

State why acid rain causes ‘nutrient leaching’ when it falls on the earth.

Give reasons why acid rain affects marine organisms.

State the impact of acid rain on the environment, other than soil chemistry and water bodies.

Enumerate the ways by which acid rain can be controlled to prevent its adverse effects on the environment.

State what are ‘greenhouse gases’ and name the major greenhouse gases.

What is green house effect?

State the consequence of the greenhouse effect.

Explain how global warming takes place in the presence of green house gases. Give a reason why the surface temperature of earth is maintained in absence of green house gases.

Give balanced equations for the formation of carbon dioxide – a major greenhouse gas, during combustion of fossil fuels.

State two natural and two man-made sources of the green house gas – methane.

‘Oxides of nitrogen namely nitrous oxide, are released into the atmosphere from varied sources’. Explain the statement with relevant sources.

State the impact of greenhouse gases on geographic, climatic and agricultural conditions.

Give the options for reducing green house gases by use of fuels better than fossil fuels.

State three renewable energy sources which cause less or no pollution.

Explain how promoting ‘afforestation’ and checking ‘deforestation’ reduces the release of greenhouse gases.

What is an ozone layer. State the distribution of the ozone layer in the stratosphere.

Give balanced equations for formation of ozone molecules from oxygen molecules. What type of reaction takes place, during the formation.

How is the ‘ozone oxygen cycle’ maintained in the stratosphere and state what disturbs the balance, resulting in ozone depletion or destruction, Give balanced equation for the same.

Enumerate the damage to humans, animals and plants caused due to ozone depletion.

Name the chemicals responsible for destruction of the ozone layer. State the main chemical from these chemicals, which is responsible for more than 80% ozone depletion.

State the role of chlorofluorocarbons in ozone destruction or depletion [no equations required].

Enumerate methods of protecting the ozone layer and preventing its depletion.

Select the correct answer from the following statement:

The major pollutant released during burning of fossil fuels.

The greenhouse gas, which on combustion produces another greenhouse gas.

Select the correct answer from the following statement:

The gas which in presence of U.V. light gives two atoms of the same gas.

Select the correct answer from the following statement:

A chemical responsible for ozone depletion.

A renewable source of energy which causes minimum or no pollution.

Give balanced equation for the following conversion [one or two steps].

Sulphur trioxide to sulphuric acid – a constituent of acid rain.

Give balanced equation for the following conversion [one or two steps].

Nitrogen to nitrogen dioxide – in an internal combustion engine.

Give balanced equation for the following conversion [one or two steps].

Methane to carbon dioxide – a green house gas.

Give balanced equation for the following conversion [one or two steps].

A molecule of ozone to two molecules of oxygen gas.

Give balanced equation for the following conversion [one or two steps].

Oxygen to ozone gas by photolysis.

Give reason for the following:

Natural rain water does not have a pH of 7 [i.e. neutral]

Give reason for the following:

A catalytic converter in an internal combustion engine reduces pollution.

Give reason for the following:

In the absence of greenhouse gases, the surface temperature of the earth is maintained.

Give reason for the following:

The formation of ozone involves a chemical reaction called photolysis.

Give reason for the following:

Destruction of ozone layer is harmful for both humans and plants.

Name or state the following:

An atmospheric pollutant produced during lightening discharge.

Name or state the following:

A form of wet deposition of acid rain other than rain water.

Name or state the following:

An atmospheric pollutant responsible for both global warming and ozone depletion.

Name or state the following:

A green house gas which contains carbon and hydrogen only.

Name or state the following:

The atom which reacts with oxygen to form ozone.

Acid rain has adverse effect on the environment State the effect acid rain has on the following: 

The nutrients present in the soil.

Acid rain has adverse effect on the environment State the effect acid rain has on the following: 

The acidity of the soil.

Acid rain has adverse effect on the environment. State the effect acid rain has on the following: 

The fertility of the soil.

Acid rain has adverse effect on the environment State the effect acid rain has on the following: 

The pH of water bodies.

Acid rain has adverse effect on the environment State the effect acid rain has on the following: 

The rate of photosynthesis in plants.

The diagram represents the green house effect.

State why the effect is called ‘global warming’.

The diagram represents the greenhouse effect.

Name a process which (a) releases (b) absorbs – greenhouse gas – CO₂.

The diagram represents the green house effect.

State an advantage of use of C.N.G. over combustion of fossil fuels.

The diagram represents the greenhouse effect.

Which of the following – biofertilizers or nitrogenous fertilizers reduces the greenhouse gas – CO₂? Explain.

The diagram represents the green house effect.

Does the sea level rise or fall due to global warming. Explain.