Question # 1

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

Value of chemical oxygen demand (COD) is a measure of chemically oxidizable matter in water. Which value of COD will indicate more polluted water

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low value

higher value

both values

none of these

Which is unnecessary for purification of water for drinking purposes

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Coagulation

Aeration

Treatment with Iodine

Treatment with chlorine

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

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

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Four

Two

Three

Five

Contamination of water of tanning industries is due to:

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Cr(III)

Cr(VI)

Mn(III)

Mn(VII)

The largest item which is recycled is

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newspaper

plastic

aluminium

oil

Newspapers can be recycled again and again by how many times

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5

2

4

3

The scope of environmental chemistry is to study:

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Source of chemicals

Transportation of chemicals

Transportation of toxic chemical

All of these

Forms of waste products:

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Heat

Smoke

Solid

All of these

A pollutant affects

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Human affects

Quality of life

Functioning of ecosystem

All of these

Pathogens in raw water are killed in step:

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aeration

coagulation

chlorination

treatment

The layer of earth around the earth is called:

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Atmosphere

Hydrosphere

Lithosphere

Biosphere

Dissolved impurities of potable water can be separated by the process of

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reduction

Aeration

Electrolysis

Co-angulation

CFCs are mainly used in industries due to

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Low cost

Gaseous nature

High reactivity

Un stability

Poisoning of CO can be reveresed by giving oxygen at pressure:

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low

least

medium

High

Transportation causes to produce CO₂ in atmosphere:

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72%

73%

74%

75%

Which of the following substance is not present in acid rain?

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Sulphuric acid

Nitric acid

Sulphurous acid

Acetic acid

Which gases are produced from landfills?

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NH₃

H₂S

N₂

All of these

Main cause of reducing map is:

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Combustion of coal

NO and NO₂

Un-burnt hydrocarbons

All of these

Materials suspended in water or present as colloidal form in raw water are removed by:

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aeration

coagulation

chlorination

treatment

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