Question # 1

The ozone depletion in the stratophere is mainly due to the reaction of ozone with

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Freons

CFCs

Both A and B

None

Leather tanneries use big auantities of:

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Cr Vi salts

Cr III salts

Mn-salts

Pb-salts

HOCl is a compound:

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Polor inorganic

organic

Ionic

covalant

Chemicals used to kill herbs are:

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Herbicides

Insecticides

Pesticides

Fungicides

Chlorination of water is effective for

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Killing pathogens

Removing dust

Removing hardness

Increasing oxygen content

Commonly used coagulants are ions of:

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Ferrous

Al

Cr

Ferric

Detergents are surfactants and they reduce the

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B.P. of water

Surface tension of water

Wetting ability of water

None of these

COD of water can be measured by

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Cr₂O₃

Cr₂O₄^-2ions

Cr₂O₇^-2ions

None of these

A large hole in the ozone layer over antarctica region was discovered in:

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1960s

1970s

1980s

1990s

Water is purified by the process:

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Aeration

Coagulation

Chlorination

All of these

Water bodies are included in:

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Atmosphere

Hydrosphere

Lithosphere

All of these

Components of environment is (in km) around the earth:

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10 km

100 km

1000 km

1500 km

The normal amount of overhead ozone is about in DU:

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150

250

350

450

A single chloride free radical of CFCs can destroy upto ozone molecules:

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10

100

1000

100000

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

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Four

Two

Three

Five

Half of the mass of atmosphere is concentrated above earth at the hieght of

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40 Km

25-28 Km

5-6 Km

100 Km

Lanthanides an actinides belong to following group of periodic table:

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IB

VIIIB

IIB

IIIB

SO₂and NO₂cause pollution due to increase in

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Buffer action

Basicity

Acidity

Neutrality

99.5% mass of lithosphere is made of

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03 elements

8 elements

11 elements

15 elements

Smaller unit of biosphere is:

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specie

ecosystem

plankton

troposphere

Coagulation in the purification of water is carried out by

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Alum

NiSO₄

BaSO₄

CuSO₄

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