Question # 1

Which gas produces air pollution?

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oxides of sulphur

oxides of carbon

all of these

alum or aluminium sulphate used as coagulant in alkaline medium change into precipitate of radicals of alumimium.

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sulphates

oxides

hydroxides

chlorides

Petroleum or crude oil is a complex mixture of compounds mainly:

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benzene

minerals

hydrocarbons

phenols

Which of following is primary pollutants

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N₂O

PAN

H₂SO₄

None of these

Hydrosphere covers the surface of erath:

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70.8%

71.8%

72.8%

73.8%

In big/metropolitan cities, atmosphere is mostly polluted due to

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Radioactive fall out

Household waste

Pesticide residue

Automobile exhausts

Water exist in only

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One state

Two state

Three states

4 states

Forms of waste products:

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Heat

Smoke

Solid

All of these

A single chloride free redical can destroy bow many ozene molecules?

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100

100000

10000

10

One of the environmental problem is the formation of oil slicks when oil is spilled form tankers in sea water. Which treatment is suitable to remove oil slicks

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Blow air

Add Na₂CO₃

Use a specially made sorbent having fluorine trapped in it

Use a sorbent having Al₂O₃trapped in it

Potable water is considered to be

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Safe for human consumption

The ground water

The surface water

Now safe for human consumption

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⁺

Test of incomplete combustion of petrol in the presence of

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CO₂

SO₂

NO₂

Co

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

Oceans cove ____________ percent of the surface of the earth

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60

70

80

97

The pH range of the acid rain is

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7 - 6.5

6.5 - 6

6 - 5.6

Less than 5

Which of the following is not the required condition for the formation of smog

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Sufficient NO

Sunlight

Less movement of air

Winds

Ozone layer is present in

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Troposphere

Stratosphere

Mesosphere

Ionosphere

Ozone is present in layer around earth:

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atmosphere

tropospher

stratosphere

thermosphere

Ozone acts as:

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Pollutant

saver

oxidatant

All of these

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