Question # 1

The pH of truly acidic rain is

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7-6.8

6.5-6

6-5.6

less than 5

Water is disinfected by a substance to avoid toxification

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KMnO₄

Alums

O₃

Cl₂

In purification of potable water the coagulant used is

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Nickel sulphate

Copper sulphate

Barium sulphate

Alum

Half mass of atmosphere gases is present in.

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5-6 km distance above the surface of earth

10 km above the surface

100 km above the surface

56 km above the surface

The normal amount of overhead ozone is.

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300 DU

350 DU

400 DU

450 DU

Ecosystem is a smaller unit of

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lithospher

hydroshper

atmosphere

biosphere

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

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5

3

4

2

The residence time of NO is

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Few hours

1 day

3 days

4 days

On earth polar ice caps and glacier contains H2O

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1%

2%

3%

10%

Ozone is mostly produced in

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Tropical region

North polar region

South polar region

Thermosphere zone of atmosphere

The temperature in the incineration of industrial and hazardous waste process has a range.

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900 to 1000 ^oC

250 to 500^oC

950 to 1300^oC

500 to 900^oC

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

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Lead

Chromium (VI)

Copper

Chromium (III)

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

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NH2Cl

NCl2

HOCl

NHCl2

Which one of the following is secondary pollutant of atmosphere.

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CO

NO2

SO2

H2SO4

A single chloride free radical can destroy how many ozone molecules.

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100

100000

10000

10

Which is a secondary pollutant

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Carbonic acid

CO₂

SO₂

CO

Fungicides are teh pesticides which

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Control the growth of fungus

Kill insects

Kill plant

Kill herbs

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