Question # 1

Ozone is an allotropic form of:

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Carbon

Phosphorus

Oxygen

Sulfur

Chlorofluorocarbons and aerosols are inert in sphere:

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troposphere

stratosphere

lithosphere

hydrosphere

Oxides of sulphur react in atmosphere by various reactions to form:

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sulphates

sulphites

sulphides

sulphate aerosols

To purify water which has mud dissolved in it, a substance which coagulates the suspended particles is used.

The coagulant may be

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Ag⁺

Cu²⁺

Al³⁺

Si⁴⁺

A single free chlorine redical can destroy ozone molecules upto:

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100000

100

1000

10000

Coal contains percentage of sulphur:

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1-9%

5-9%

6-9%

7-9%

SO₂and NO₂cause pollution due to increase in

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Buffer action

Basicity

Acidity

Neutrality

Which factor is helping to reduce the environmental pollution

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Urbanization

Industrialization

Increase of plantation

Rapid growth of population

The suspended particles in the raw water can be removed by the

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Coagulation

Aeration

Hydration

Dehydration

Which one is more toxic?

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Fe

C

Hg

Ag

Exhaust fumes of cars contain which poisonous gas

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CH₄

C₂H₆

CO

All of these

Heat balance of earth is maintained by sphere:

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Hydrosphere

atmosphers

lithosphere

biosphere

Hydrosphere includes

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Seas and rivers

Ocean & polar ice caps

Ground water

All of above

Rigid rocky crust earth upto a depth of 100 km is called:

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Atmosphere

Hydrosphere

Lithosphere

All of these

The overall effect of the photochemical smog in the after noon is built up of

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Neutralization

oxidizing agent

Reducing agent

Activating agent

BOD is the oxygen demand with in day(s):

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Four

Two

Three

Five

Fungicides are the pesticides which

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Kill plants

Kill herbs

Kill insects

Control the growth of fungus

Water is considered pollutant when value of Do is

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6 PPM

8 PPM

03 PPM

10 PPM

Chlorofluorocarbon, CF₂Cl₂, plays an effective role in removing O₃(ozone) in the stratosphere. Which reaction does not cause the depletion of ozone

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Test of incomplete combustion of petrol in the presence of

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CO₂

SO₂

NO₂

Co

SO₂makes ___________ acid rains

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carbonic acid

Sulfuric

Nitric acid

All of these

Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg Toxic.

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It attaches to sulphur of the disulphide link

Hg is a heavy metal

Hg is liquid at room temperature

Hg is non reactive chemically

CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destory

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50,000

10,000

20,000

None of these

In the atmosphere, O₂is about

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10%

15%

21%

25%

Industrial effluents have toxic synthetic organic compounds as well as heavy metals like

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Pb

Cr

Hg

All of these

The normal amount of overhead ozone is about in DU:

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150

250

350

450

Chemical like Al₂(SO₄) or alum are used in purification of water druing step:

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aeration

coagulation

chlorination

treatment

Ozone is most of the tropical regions acts as a pollutant and causes

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Damages to eyes

Aggravates asthma

Chest discomfort

All of these

Region of earth capable of supporting life is called:

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Atmosphere

Hydrosphere

Lithosphere

All of these

As the number of carbon atoms increase the number of isomers also increase. The six carbon compound hexane has as many as:

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10 isomers

3 isomers

5 isomers

6 isomers

Newspapers can be recycled again and again by how many times

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5

2

4

3

CFC's are known to cause depletion of ozone layer therefore their use has been banned in refrigerators and air conditioners. Which alternate compound may be suitable to replace CFC

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CCl₄

CHCl₃

CH₃- CH₂- CH₂- CH₃

CHCl₂- CHF₂

In addition to many pollutants present in ground water, a successful study was conducted to remove a highly Toxic chemical.What chemical is this

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Cobalt

Nickel

Arsenic

Sulphur

Most harmful of biosphere is

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Deforestation

Nuclear fail out

Salinity

Water logging

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