Question # 1

In purification of potable water the coagulant used is:

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Nickel sulphate

Copper sulphate

Barium sulphate

Aluminium sulphate

Which of the following factors is not used to determine the quality of water

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COD

BOD

DO

Available chlorine

Reason of pollution are:

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Population and urbanization

Transportation

Industrialization

All of these

SO₂produced by volcanoes is about

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75%

67%

69%

70%

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

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Coagulation

Aeration

Hydration

Dehydration

The most important pesticides are:

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Herbicides

Insecticides

Fungicides

All

Alkali metals react viotlently with halogens:

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Halides

Anhydrides

Hydrides

None of the above

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

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

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NO

SO₂

O₃

Hydrocarbons

Which is the most toxic among the given?

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heavy metals

non-metals

Metals

Metalloids

Oceans cove ____________ percent of the surface of the earth

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60

70

80

97

A single chlorine free radical can destory how many ozone molecules

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10

100

1000

10000

99.5% mass of lithosphere is made of

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03 elements

8 elements

11 elements

15 elements

Water is considered pollutant when value of Do is

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6 PPM

8 PPM

03 PPM

10 PPM

Which heavy metals do not have any safe limits

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As

Hg

Cr

All of these

Solid waster of the city is disposed off by dumping in a landfill. Which of the following gas is produced in the landfill

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Oxygen

Chlorine

Hydrogen sulphide

Hydrogen chloride gas

CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destroy

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10,000

20,000

100,000

50,000

Ocean contains part earth's water:

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95%

96%

97%

98%

Part of fresh water consumed in domestic purpose:

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1%

2%

69%

8%

Ozone is present in layer around earth:

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atmosphere

tropospher

stratosphere

thermosphere

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

Agriculture consumes part of fresh water:

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1%

2%

69%

23%

0.1M HCI having pH =1.0 it is about 100 time stronger than acetic acid what will be the pH of acetic acid:

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0.1

1.3

2

3

The main pollution of leather tanneries in the waste is due to the salt of

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Chromium

Copper

Chromium

Lead

Smaller unit of biosphere is:

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specie

ecosystem

plankton

troposphere

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

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low

least

medium

High

Sea gets polluted bu accidental oil spills and

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Atmospheric pressure

Nitrogen gas

Cargo oil tankers

Aero plane

Half of the mass of atmosphere is concentrated above earth at the hieght of

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40 Km

25-28 Km

5-6 Km

100 Km

Suspended matter is settled in purification of water by:

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aeration

coagulation

chlorination

treatment

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

Ozone is an allotropic form of:

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Carbon

Phosphorus

Oxygen

Sulfur

Which factor is helping to reduce the environmental pollution

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Urbanization

Industrialization

Increase of plantation

Rapid growth of population

By the mid of 1980s depletion of total overhead ozone in antarctic region is

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20%

30%

40%

50%

Biological oxygen demand (BOD) is associated with

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Organic matter

Micro organisms

Both a and b

None

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

Leather tanneries use big auantities of:

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Cr Vi salts

Cr III salts

Mn-salts

Pb-salts

Electropositive character increases down the groups due to:

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Increase in atomic size of the elements

Decrease in ionization potential

Decreases in electromagnetically of the element

All the above

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 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

Soil remediation means

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to make it suitable for cultivation of crops

to make it acidic

to make it alkeline

to add manure into it

Chlorofluorocarbon, CF₂Cl₂, plays an effective role in removing O₃(ozone) in the stratosphere. Which reaction does not cause the depletion of ozone

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Transformation is a cyclic process in which used plactic is

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Remelted and styrene is added

Converted into low quality substance

Converted back into original components

None of these

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

Site of land for landfill is selected based upon.

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topography

location of ground

water table

All of these

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

Many petroleum products are:

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coloured

colourless

testy

poisoinous

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

Addition of washing soda removes

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Softness of water

Temporary hardness of water

Permanent hardness of water

Hydrogen from water

The destructive distillation of coal gives three products. which of following is not the product of destructive distillation of coal?

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Coal tar

CO₂

Coal gas

Coke

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

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 main pollutant of leather in the waste water is due to the salt of:

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Lead

Chromium (VI)

Copper

Chromium (III)

Carbon Monoxide is:

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colouriess

orderless

high toxic

All of these

An excellent source of energy without causing pollution is

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Fossil fuel

Sun

Petroleum

Nuclear reactor

Natural water is

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Pure

Impure

Acts as solute

Distilled

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

Water is purified by the process:

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Aeration

Coagulation

Chlorination

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

Which of the following is not a secondary pollutant

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Ozone

Carbonic acid

Sulphuric acid

Carbon dioxide