Question # 1

Chlorination of water is effective for

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Killing pathogens

Removing dust

Removing hardness

Increasing oxygen content

Nitrogen percentage in atmosphere is:

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76%

77%

78%

79%

Part of fresh water consumed in domestic purpose:

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1%

2%

69%

8%

SO₂makes ___________ acid rains

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carbonic acid

Sulfuric

Nitric acid

All of these

The concentration of dissolved molecular oxygen in water which acts as the most important oxidizing agent ranges from

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2 ppm - 6 ppm

2 ppm - 4 ppm

4 ppm - 8 ppm

2 ppm - 3 ppm

Any substance in the environment which adversely affects the human health and natural functioning of the Ecosystem is known as

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environment

hydrosphere

pollutant

biosphere

Ozone is most of the tropical regions acts as a pollutant and causes

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Damages to eyes

Aggravates asthma

Chest discomfort

All of these

Ocean contains part earth's water:

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95%

96%

97%

98%

Ph of unpolluted rain water is

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07

Less than 6

5.6

Less than 5

Which is property of CO?

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Soluble in water

Insoluble in water

No toxic

Pole coloured

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

The smog having high contents of SO₂is

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Neutral smog

Reducing smog

Oxidizing smog

Artificial smog

The percentage of SO₂ produced by volcanoes is:

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47%

57%

67%

77%

The temperature in the incineration of industrial and hazardons waster process had a range

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950 to 1300°C

500 to 900°C

250 to 500°C

900 to 1000°C

Lanthanides an actinides belong to following group of periodic table:

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IB

VIIIB

IIB

IIIB

Region of earth capable of supporting life is called:

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Atmosphere

Hydrosphere

Lithosphere

All of these

What is the morality of a solution containing 15g of urea is 500cm³ of solution?

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1M

0.5M

2M

1.5M

Heat balance of earth is maintained by

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Atmosphere

Hydrosphere

Lithosphere

Stratosphere

A chemist says that glass must be a super cooled liquid. the reason that he might have in his mind is that glass has:

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Definite shape

Definite volume

Crystalline structure

No crystalline structure

Transportation causes to produce CO₂ in atmosphere:

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72%

73%

74%

75%

How much quantity of water is in the domestic use

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0.08%

16%

24%

90%

Which of the following is not a heavy industry?

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Iron

Fertilize

Paper

None

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

Coal contains sulphur in it:

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1-3%

1-6%

1-9%

1-12%

Test of incomplete combustion of petrol in the presence of

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CO₂

SO₂

NO₂

Co

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

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Eyes

Ears

Stomach

Nose

Ozone is usually produced in the

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South polar region

North pole region

Tropical region

Thermosphere zone

During thunderstorms, water dissolves

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Dust particles

HCl

Nitric acid

Clouds

Exhaust fumes of cars contain which poisonous gas

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CH₄

C₂H₆

CO

All of these

Many petroleum products are:

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coloured

colourless

testy

poisoinous

As the number of carbon atoms increase the number of isomers also increase. The six carbon compound hexane has as many as:

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10 isomers

3 isomers

5 isomers

6 isomers

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

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benzene

minerals

hydrocarbons

phenols

The morality of the solution containing x grams ammonium sulfate in 500cm3 of the solution is 0.6 what is x?

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39.6

40.5

42.7

45.1

The gases in the atmosphere are essential for sustaining life on earth. Thus oxygen is required for breathing. What for is carbon dioxide required

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To help plant to under go photosynthesis

To destroy nitrogen oxide from the atmosphere

To help to clean the atmosphere

To help in fixing of bacteria

DDT is a:

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Fungicide

Insecticide

Herbicide

All

Chemistry related to the study of environment affected by the chemicals and pollutants is called:

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Biochemistry

Physically chemistry

Pharmaceutical chemistry

Environmental chemistry

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

Which step is unnecessary for purification of water for drinking purposes

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aeration

coagulation

treatment with chlorine

treatment with iodine

Leather tanneries use big auantities of:

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Cr Vi salts

Cr III salts

Mn-salts

Pb-salts

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

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aeration

coagulation

chlorination

treatment

The pH of the rain water in areas where acid rain is the cause of pollution may be

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6.5

5.6

4.5

2.2

Cyclone collector is used to reduce

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Noise pollution

Air pollution

Water pollution

Radioactive pollution

Elevated concentration of ______________ is harmful for fish as it clog the gills causing suffocation

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AI

Hg

As

Cr(vi)

Acid rain is caused when various atmospheric gases dissolve in rain water. What are the gases that cause rain water

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SO₂

NO₂

CO

a and b only

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

In Purification of potable water the coagulant used is

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nickel sulpahte

copper sulpahte

barium sulphate

alum

Which is not the affect of polluted air on environment

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acid rain

smog

ozone

global warming

Lead pollution is mainly due to

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Metallic pollution

Space pollution

Acid rain

Cd pollution

Men residence time of methane in atmosphere in years is:

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1-7

2-7

3-7

4-7

The layer of earth around the earth is called:

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Atmosphere

Hydrosphere

Lithosphere

Biosphere

The normal amount of overhead ozone is about

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250 Du

300 DU

350 DU

400 DU

Ozone layer is high:

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20-23 km

22-25 km

23-26 km

25-28 km

Ozone gas has boiling point:

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Low

High

Medium

Highest

Exposure to CO results in

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Headche

Fatigue

Unconsciousness

All of these

A single chloride free radical of CFCs can destroy upto ozone molecules:

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10

100

1000

100000

Ozone is present in layer around earth:

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atmosphere

tropospher

stratosphere

thermosphere

Primary pollutants are:

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oxides of sulphur

oxides of carbon

oxides of nitrogen

All of these

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

Boron, aluminium, gallium, indium and thallium belong to group lll-A of the periodic table show a decrease with increasing relative atomic mass:

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Ionic character of the compounds

The first ionization energy

The basic character of the oxides

The stability of +2 oxidation