Question # 1

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

99.5% mass of lithosphere is made of

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03 elements

8 elements

11 elements

15 elements

How can heavy metal contamination like the presence of Hg or Pb may be removed from the soil

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by using water spray

by blowing air

by treating with EDTA and then flushing the heavy metal complex out of the soil

by adding CaO

Water cover earth surface more than:

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50%

60%

70%

80%

The percentage of SO₂ produced by volcanoes is:

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47%

57%

67%

77%

A single chlorine free radical can destory how many ozone molecules

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10

100

1000

10000

Ozone is produced in regions:

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tropical

Polor

antaric

equator

In addition to many pollutants present in ground water, a successful study was conducted to remove a highly Toxic chemical.What chemical is this

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Cobalt

Nickel

Arsenic

Sulphur

Part of fresh water consumed in industry is:

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1%

2%

69%

23%

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

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low

least

medium

High

The normal amount of overhead ozone is

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350 DU

450 DU

400 DU

300 DU

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

Water which his considered to be safe for human consumption is known as

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distilled water

contaminated water

potable water

rain water

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

Potable water is considered to be

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Safe for human consumption

The ground water

The surface water

Now safe for human consumption

A single free chlorine redical can destroy ozone molecules upto:

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100000

100

1000

10000

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

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aeration

coagulation

chlorination

treatment

The film forming components of paints are

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resins

thinners

pigments

driers

Chemicals used to kill fungi are:

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Herbicides

Insecticides

Pesticides

fungicides

Detergents are surfactants and they reduce the

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B.P. of water

Surface tension of water

Wetting ability of water

None of these

HOCl is a compound:

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Polor inorganic

organic

Ionic

covalant

Which of the following air pollutant is called quiet killer

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PAN

CO

NO₃

SO₃

In big/metropolitan cities, atmosphere is mostly polluted due to

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Radioactive fall out

Household waste

Pesticide residue

Automobile exhausts

Main cause of reducing map is:

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Combustion of coal

NO and NO₂

Un-burnt hydrocarbons

All of these

Water is purified by the process:

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Aeration

Coagulation

Chlorination

All of these

Ozone layer is

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25 - 28 km high

26 - 29 km high

24 - 27 km high

20 - 28 km high

Addition of washing soda removes

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Softness of water

Temporary hardness of water

Permanent hardness of water

Hydrogen from water

Petroleum or crude oil is a complex mixture of compounds mainly:

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benzene

minerals

hydrocarbons

phenols

Why a C- C bond breaks by uv light

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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

Hydrosphere covers the surface of erath:

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70.8%

71.8%

72.8%

73.8%

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

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10 km

100 km

1000 km

1500 km

Ground and surface waters are contaminated and become polluted due to the human activity. Which human activity will not cause water pollution

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live stock waste

agricultural pesticides

oil beaks and spills

all of the above

Ozone layer is present in

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Troposphere

Stratosphere

Mesosphere

Ionosphere

During incineration temperature range of non-rotating chamber is

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900-1000C°

650-1100C°

950-1300C°

700-900C°

Leaching of nutrients is due to

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Drying of soil

Combustion of soil

Acidification of soil

Neutralization of soil

What is component of environment?

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Atmosphere

Hydrosphere

Lithosphere

All of these

What is the effect of polluted air on environment

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Ozone

Acid rain

Global warming

Smog

The respiration process taking place in animals depends on a difference in

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Partial pressure

Osomotic pressure

Vapour pressure

Atomospheric pressure

Augus smith discovered in the mid of seventeenth century:

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acid

Base

Acid rain

Fertilizer

Ozone layer is high:

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20-23 km

22-25 km

23-26 km

25-28 km

The toxic organic compounds and heavy metals and metalloids results in contamination of

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surface water

ground water

both surface and ground water

neither surface nor ground waters

Coal contains sulphur in it:

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1-3%

1-6%

1-9%

1-12%

Increased awareness of environment issues has led chemist 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

Eleven elements made part of earth mass:

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97.5%

98.5%

99.5%

100%

Ratio of hydrogen (H) and oxygen (O) in water molecule by volume is

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2: 1

1: 2

3: 1

4: 1

Peroxyacetylnitrate (PAN) is an irritant to human beings and it affects:

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Eyes

Ears

Stomach

Nose

Agriculture consumes part of fresh water:

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1%

2%

69%

23%

It is a biodegradable pollutant

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Salts of HG

DDt

Aluminum foil

Domestic fuel

Synthetic organic pesticides formulated nowadays are more then:

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One thousand

Ten thousand

Two thousands

Twenty thousand

Which one of the pollutants of automobile exhausts affects the nervous system or produces mental diseases

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NO₂

SO₂

Hg

Pb

The water is considered to be polluted when the concentration of oxygen in it is

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6 - 9ppm

6 ppm

8 ppm

Less than 4pm

Which of the following human activities are contaminating surface and ground waters?

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pesticides

septic ranks

petroleum and natural gas production

all of these

Fungicides are the pesticides which:

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Control the growth of fungus

Kills insects

Kills plants

Kill herb

Which is not considered as pollutant

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O₃

CO₂

NO₂

SO₂

Diseases like dysentery, typhoid and hepatitis are caused by mixing of in water:

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Live stock wastes

Oil spilage

detergents

pesticides

Ecosystem is a smaller unit of

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Hydrosphere

Lithosphere

Biosphere

Atmosphere

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

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2 - 4 ppm

4 - 6 ppm

2 - 5 ppm

4 - 8 ppm

Which one of the following is used as coagulant for purification potable water

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Copper sulphate

Alum

Barium sulphate

Nickel sulphate

The 95.5% mass of Lithoshone is made of 11 elements i,e O₂, Si, Al, Fe, Ca, Na, K, Mg, Ti, H₂and P. Which element is present in trace amount

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iodine

bromine

lead

carbon