Question # 1

The avoid teh formation of toxic compounds with chlorine which substance is used for disinfecting water.

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KMnO4

O3

Alum

Chloramines

Disinfection of water by chlorine is done by the production of.

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NH2Cl

NCl2

HOCl

NHCl2

The main pollutant of leather tanneries in the waste water is due to

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Lead

Chromium VI

Copper

Chromium III

Acid rain fist of all was observed by

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Augus Smith

Robert Hook

Mosley

Watson

Peroxyacetylnitrate (PAN) is an irritant to human beings and it affects

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eyes

ears

stomach

nose

The avoid the formation of toxic compounds with chlorine which substance is used for disinfecting water

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KMnO₄

O₃

Alums

Chloramines

The pH range of the acid rain is

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7-6-5

6.6-6

6-5.6

less than 5

The thickness of ozone layer is.

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25 to 50 km

25 to 28 km

3 km only

1 km only

Which one is primary pollutant.

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Peroxyacetyl nitrate

Sulphuric acid

Carbonic acid

Carbon monoxide

The region of earth capable of supposing life is called.

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Atmosphere

Bisphere

Dithosphere

Hydrosphere

Ozone depletion in stratosphere region is mainly due to the reaction of O3 with

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O2

SO2

CFCs

All of these

On earth polar ice caps and glacier contains H2O

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1%

2%

3%

10%

The news paper can be recycled again and again as many times as

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5

3

4

2

Photochemical smog mainly consist of

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Higher hydrocarbons

Oxidising agnts

Reducing agent

All of these

In purification of potable water the coagulant used is

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Nickel sulphate

Copper sulphate

Barium sulphate

Alum

Fungicides are the pesticides which

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Control the growth of fungus

Kill insects

Kill plants

Kill herbs

The yellowish colour in photochemical smog is due to the presence of.

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NO

NO2

SO2

CO2

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