Question # 1

Chemical like Al₂(SO₄) or alum are used in purification of water druing step:

Choose an answer

aeration

coagulation

chlorination

treatment

Term ozone hole is used for depletion of ozone during months of:

Choose an answer

Jan-Feb

March - Sep

Sep- Nov

Dec-Feb

For incineration temperature range is (in ^oC)

Choose an answer

700-800

800-900

900-1000

1000-1100

Region of earth capable of supporting life is called:

Choose an answer

Atmosphere

Hydrosphere

Lithosphere

All of these

Water which forms scum with soap is called

Choose an answer

Hard water

Soft water

Distilled water

Un distilled water

Reason of pollution are:

Choose an answer

Population and urbanization

Transportation

Industrialization

All of these

Choose the chief air pollutant among the following which depletes ozone layer

Choose an answer

Carbon monoxide

Carbon dioxide

Chloroflurocarbons and nitrogen oxides

Sulphur dioxide

The normal amount of overhead ozone is

Choose an answer

350 DU

450 DU

400 DU

300 DU

Chlorofluorocarbons and aerosols are inert in sphere:

Choose an answer

troposphere

stratosphere

lithosphere

hydrosphere

Increased awareness of environmental issues has led chemists to develop products and processes that do not impact on the environment in terms of pollution or depletion of sources. To help chemist to achieve this aim, some principles are drawn. Which one is not the guiding principle

Choose an answer

Avoid waste production

Use no solvent

Use a catalyst

Devise a multistep procedure for synthesis of new compounds

The amount of Si in the lithosphere is about

Choose an answer

27.72%

30.35%

35.30%

40.21%

The range of UV-B is:

Choose an answer

320 to 400 nm

200 to 280 nm

280 to 320 nm

50 to 400 nm

Oceans, rivers, streams, leaks, polar ice caps, glaciers and group water reservoirs are included in

Choose an answer

Atmosphere

Lithosphere

Hydrosphere

Biosphere

The force which hold the atoms together to form a compound is called:

Choose an answer

Dispersion forces

London forces

A chemical bond

Ven der wall's forces

In water the most important oxidizing agent is dissolved molecular oxygen which ranges form

Choose an answer

2 - 4 ppm

4 - 6 ppm

2 - 5 ppm

4 - 8 ppm

Detergents are surfactants and they reduce the

Choose an answer

B.P. of water

Surface tension of water

Wetting ability of water

None of these

Water in swimming pools is purified by adding

Choose an answer

Sodium

Chlorine

Phosphorus

Potassium

The reason of acid rains is

Choose an answer

Release of CO in excess by in complete combustion

Excess release of NO₂and SO₂from buring of fossil fules

Formation of excess CO₂due to combustion and respiration

Formation of NH₃in excess from industry and coal gas

Residence time of methane in the atmosphere is

Choose an answer

3 - 7 days

2 -3 days

3 - 7 years

2 - 3 years

Why a C - Cl bond breaks by uv light

Choose an answer

Cl is most electronegative

Cl is volatile

C - Cl bond energy is smaller than that of C - H bond energy

Uv light provides energy which is sufficient to break C - Cl bond and not C - H bond

Biochemical oxygen demand is the capacity of organic matter in natural water to consume oxygen

Choose an answer

2 days

5 days

6 days

7 days

More Classes

Other Links

MDCAT Chemistry Chapter 21 Environmental Chemistry Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer