Question # 1

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 thickness of ozone layer is.

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25 to 50 km

25 to 28 km

3 km only

1 km only

The pH range of the acid rain is

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7-6-5

6.6-6

6-5.6

less than 5

Peroxyacetyl nitrate is an irritant to humab beings and it affects

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Eyes

Ears

Stomach

Nose

The pH of unpolluted rain water should be

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5.00

5.60

6.50

7.00

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

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KMnO4

O3

Alum

Chloramines

Photochemical smog mainly consist of

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Higher hydrocarbons

Oxidising agnts

Reducing agent

All of these

The minimum temperature of troposphere is.

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-2^oC

-56^oC

-100^oC

15^oC

Ozone is mostly produced in

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Tropical region

North polar region

South polar region

Thermosphere zone of atmosphere

Ecosystem is smaller unit of

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Lithosphere

Hydroshpere

Amosphere

Biosphere

A single chloride free radical can destroy how many ozone molecules

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100

100,000

100,00

unlimited

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

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Lead

Chromium VI

Copper

Chromium III

In which layer of atmosphere, ozone is present.

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Thermosphere

Mesosphere

Stratosphere

Troposphere

Which is a secondary pollutant

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Carbonic acid

CO₂

SO₂

CO

Ecosystem is a smaller unit of

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lithospher

hydroshper

atmosphere

biosphere

Thickness of atmosphere is about how much kilometer above the surface of warth

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100 km

1000 km

10,000 km

unlimited

The pH of truly acidic rain is

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7-6.8

6.5-6

6-5.6

less than 5

Which field produces significant amount of methane in the atmosphere

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paddy field

Cotton field

Can sugar field

Wheat field

Which one of the followings is not a pollutant.

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CO2

NO2

CO

SO2

The pH range of the acid rain is.

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7-6.5

6.5-6

6-6.5

Less than 5

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