Question # 1

Which gas produces air pollution?

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oxides of sulphur

oxides of carbon

all of these

Which not a method for solid waste management>

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Landfill

Incinerating

Recycling

None of these

The pH range of the acid rain is

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6.5 - 6

Less than 5

8 - 7.5

7 - 6.5

Organic pollutants in water are measured by

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DO

COD

Water logging

PH

Ozone layer is

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25 - 28 km high

26 - 29 km high

24 - 27 km high

20 - 28 km high

The range of UV-B is:

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320 to 400 nm

200 to 280 nm

280 to 320 nm

50 to 400 nm

Which of the following does not contribute towards the formation of photochemical smog?

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NO

SO₂

O₃

Hydrocarbons

Ecosystem is a smaller unit of

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Hydrosphere

Lithosphere

Biosphere

Atmosphere

A single chlorine free radical can destroy how many ozone molecules

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100

100000

10000

10

Many petroleum products are:

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coloured

colourless

testy

poisoinous

Amount of fresh water used by agriculture is

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2%

23%

69%

97%

The temperature in the incineration process has a range:

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900 to 1000°C

650 to 1100°C

950 to 1300°C

500 to 900°C

Biochemical oxygen demand (BOD) is the capacity of organic matter in natural water to consume oxygen with in a period of

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2 day

6 day

5 day

7 day

Contaminated soil can be cleaned by various methods. Which method is not used to clean the soil

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diffusion

convection

electrophoresis

chromatography

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

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2 days

5 days

6 days

7 days

Temporary hardness can be removed by adding

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Lime

Carbon

Oxygen

Slaked lime

Leachate contains:

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fatty acids

Bacteria

Heavy metals

All of these

Photochemical smog consists of higher concentration of:

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Oxidants

Ozone

a & b

NO₃

Coagulation in the purification of water is carried out by

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Alum

NiSO₄

BaSO₄

CuSO₄

Fungicides are the pesticides which:

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Control the growth of fungus

Kills insects

Kills plants

Kill herb

One of the environmental problem is the formation of oil slicks when oil is spilled form tankers in sea water. Which treatment is suitable to remove oil slicks

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Blow air

Add Na₂CO₃

Use a specially made sorbent having fluorine trapped in it

Use a sorbent having Al₂O₃trapped in it

The normal amount of overhead ozone is about

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250 Du

300 DU

350 DU

400 DU

alum or aluminium sulphate used as coagulant in alkaline medium change into precipitate of radicals of alumimium.

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sulphates

oxides

hydroxides

chlorides

The pH range of the acid rain is

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7 - 6.5

6.5 - 6

6 - 5.6

Less than 5

The branch of chemistry interlinked with biology, physics, medicines, agriculture, public health and sanitary engineering etc. is:

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Biochemistry

Physical chemistry

Pharmaceutical chemistry

Environmental chemistry

Heat balance of earth is maintained by

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Atmosphere

Hydrosphere

Lithosphere

Stratosphere

Splitting of spectral lines when atoms are subjected to strong electric field is called:

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Compton effect

Stark effect

Zeeman effect

Photoelectric effect

The smog having high contents of SO₂is

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Neutral smog

Reducing smog

Oxidizing smog

Artificial smog

Out of total amount of water available for human use is

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0.30%

0.2%

40%

50%

Which of the following is not a heavy industry?

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Iron

Fertilize

Paper

None

Water is essential for life on

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Moon

Space

Earth

Sun

A large hole in the ozone layer over antarctica region was discovered in:

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1960s

1970s

1980s

1990s

Which of the following waste material is not recycled for use again

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Glasses

Paper

Plastic toys

Hides of animals

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

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Four

Two

Three

Five

The suspended particles in the raw water can be removed by the

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Coagulation

Aeration

Hydration

Dehydration

Which is not the affect of polluted air on environment

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acid rain

smog

ozone

global warming

The pH rain of acid rain is

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8 - 7

7 - 6.5

6.5 - 6

less than 5

Sea gets polluted bu accidental oil spills and

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Atmospheric pressure

Nitrogen gas

Cargo oil tankers

Aero plane

Which of spectral lines when atoms are subjected to strong electric field is called:

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Compton effect

Stark effect

Zeeman effect

Photoelectric effect

Which is not considered as pollutant

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O₃

CO₂

NO₂

SO₂

Acidification of soil can leach metal:

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Al

Hg

Pb

Ca

Leaching of nutrients is due to

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Drying of soil

Combustion of soil

Acidification of soil

Neutralization of soil

Ozone in most of the tropical regions acts as a pollutant and cause

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damages to eyes

aggravates asthma

chest discomfort

all of these

COD of water can be measured by

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Cr₂O₃

Cr₂O₄^-2ions

Cr₂O₇^-2ions

None of these

Fungicides are the pesticides which

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Kill plants

Kill herbs

Kill insects

Control the growth of fungus

CFC's are known to cause depletion of ozone layer therefore their use has been banned in refrigerators and air conditioners. Which alternate compound may be suitable to replace CFC

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CCl₄

CHCl₃

CH₃- CH₂- CH₂- CH₃

CHCl₂- CHF₂

The Catalyst used in the contact tower for the manufacture of H₂SO₄ is easily poisoned by:

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Nitrous oxide

Nitrogen gas

Arsenic oxide

Carbon dioxide

Components of environment is (in km) around the earth:

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10 km

100 km

1000 km

1500 km

Hydrosphere covers the surface of erath:

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70.8%

71.8%

72.8%

73.8%

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

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

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aeration

coagulation

chlorination

treatment

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

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Avoid waste production

Use no solvent

Use a catalyst

Devise a multistep procedure for synthesis of new compounds

Ozone acts as:

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Pollutant

saver

oxidatant

All of these

Lead pollution is mainly due to

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Metallic pollution

Space pollution

Acid rain

Cd pollution

Carbon Monoxide is:

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colouriess

orderless

high toxic

All of these

Ozone in stratosphere extends upto km:

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0-15 km

10-15 km

15-40 km

15-25 km

Which is the most toxic among the given?

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heavy metals

non-metals

Metals

Metalloids

White marble buildings are effected by?

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O₂

SO₂

CI₂

CFC_s