Question # 1

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

Hardness which can be removed by boiling is called

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Permanent hardness

Temporary hardness

Stiffness

Toughness

Oxides of sulphur react in atmosphere by various reactions to form:

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sulphates

sulphites

sulphides

sulphate aerosols

Polycyclic aromatic hydrocarbons are taught to be

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Disinfectant

Carcinogenic

Helpful

Reactive

Which is property of CO?

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Soluble in water

Insoluble in water

No toxic

Pole coloured

NO and NO₂gases in atmosphere are represented by

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NO

NO₄

NO_x

N_xO_y

Part of fresh water consumed in domestic purpose:

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1%

2%

69%

8%

Which is the following is true about galvanic cell:

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Reduction occurs at cathode

Reduction occurs at anode

Anode is negatively charged

Chathode is positively charged

Hydrocarbons, SO₂, CO, NH₃nitrogen oxides and compounds of fluorine are called

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Primary pollutant

Secondary pollutant

Tertiary pollutant

None of these

Lanthanides an actinides belong to following group of periodic table:

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IB

VIIIB

IIB

IIIB

The % of CO₂in the atmosphere is

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3.0%

0.03%

0.3%

0.5%

It is a biodegradable pollutant

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Salts of HG

DDt

Aluminum foil

Domestic fuel

Temporary hardness can be removed by adding

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Lime

Carbon

Oxygen

Slaked lime

The pH range of acid rain is?

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7-6.5

6.5-6

6-5.6

Less than 5

Which factor is helping to reduce the environmental pollution

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Urbanization

Industrialization

Increase of plantation

Rapid growth of population

The normal amount of overhead ozone is about in DU:

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150

250

350

450

The pH range of the acid rain is

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7 - 6.5

6.5 - 6

6 - 5.6

Less than 5

Hard water can block radiators due to formation of

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Insoluble calcium and magnesium salts

Insoluble sodium salts

In soluble phosphate salts

Insoluble potassium salts

In incinerating the waste is burnt at

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1000°C

100°C

2000°C

1500°C

Eleven elements made part of earth mass:

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97.5%

98.5%

99.5%

100%

Industrial effluents have toxic synthetic organic compounds as well as heavy metals like

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Pb

Cr

Hg

All of these

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