Question # 1

CFCs are mainly used in industries due to

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Low cost

Gaseous nature

High reactivity

Un stability

Nitrogen in the atmosphere is:

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78%

21%

0.9%

0.03%

Which of the following air pollutant is called quiet killer

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PAN

CO

NO₃

SO₃

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

Rigid rocky crust earth upto a depth of 100 km is called:

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Atmosphere

Hydrosphere

Lithosphere

All of these

Detergent greatly effects the

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Aquatic life

Modern life

Terrestrial life

Plants life

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

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

The pH rain of acid rain is

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8 - 7

7 - 6.5

6.5 - 6

less than 5

Heat balance of earth is maintained by sphere:

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Hydrosphere

atmosphers

lithosphere

biosphere

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

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paper

plastic

hides of animals

glass

Natural water is

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Pure

Impure

Acts as solute

Distilled

Depletion of ozone is more during the month:

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Jan-March

April-Jun

July-Aug

Sept-Nov

Incineration is a process in which solid waste is burned at high temperature ranging from

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500 to 600°C

900 to 1000°C

1000 to 1100°C

600 to 700°C

The temperature of in the incineration of industrial and hazardous waste process has range

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900 - 1000°C

250 - 500°C

950 - 1300°C

500 - 900°C

Atmosphere consists of gasses:

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N₂

O₂

Ar

All

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

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

Surface and ground water sources are contaminated by various human activities. Which of the following is not human activity that causes contamination in fresh water

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Live stock waste

Oil leaks and spills

Desposal of industrial effluents

Rain

Which of the following substance is not present in acid rain?

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Sulphuric acid

Nitric acid

Sulphurous acid

Acetic acid

Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg Toxic.

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It attaches to sulphur of the disulphide link

Hg is a heavy metal

Hg is liquid at room temperature

Hg is non reactive chemically

In incinerating the waste is burnt at

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1000°C

100°C

2000°C

1500°C

Which one of the following is an organic compound?

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Calcium carbide

Calcium cyanide

Carbon disulphide

None of these

Alkali metals react viotlently with halogens:

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Halides

Anhydrides

Hydrides

None of the above

Addition of washing soda removes

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Softness of water

Temporary hardness of water

Permanent hardness of water

Hydrogen from water

NO and NO₂gases in atmosphere are represented by

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NO

NO₄

NO_x

N_xO_y

Region of earth capable of supporting life is called:

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Atmosphere

Hydrosphere

Lithosphere

All of these

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

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

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

Lithosphere extends upto kilometer of earth crust in depth:

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10 km

100 km

1000 km

10000 km

Which is not an air pollutant

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N₂

CO

NO

N₂O

What is the cause of water pollution

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Chemical and bacterial constants in live stock

The spilled oil in rivers and ponds

Wide spreads used of pesticides

All of these

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

Which of the following is not a secondary pollutant

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Ozone

Carbonic acid

Sulphuric acid

Carbon dioxide

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

Organic pollutants in water are measured by

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DO

COD

Water logging

PH

A single chlorine free radical can destroy how many ozone molecules

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100

100000

10000

10

Agriculture consumes part of fresh water:

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1%

2%

69%

23%

Surface and ground water sources are contaminated by various human activities which of the followings is not a human activity that causes contamination in fresh water

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live stock waste

oil leaks and spills

disposal of industrial effluents

rain

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

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Coagulation

Aeration

Hydration

Dehydration

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

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aeration

coagulation

chlorination

treatment

Air pollution causes

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Acid rain

O₃ depletion

Green House Effect

All

Ph of unpolluted rain water is

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07

Less than 6

5.6

Less than 5

Chemicals used to kill herbs are:

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Herbicides

Insecticides

Pesticides

Fungicides

Global warming is mainly caused by ______ radiations

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UV

I.R

gama

X-rays

Water exist in only

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One state

Two state

Three states

4 states

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

Ozone is an allotropic form of:

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Carbon

Phosphorus

Oxygen

Sulfur

Men residence time of methane in atmosphere in years is:

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1-7

2-7

3-7

4-7

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

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

The normal amount of overhead ozone is

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350 DU

450 DU

400 DU

300 DU

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

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Copper sulphate

Alum

Barium sulphate

Nickel sulphate

Ozone is a gas having boiling point

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Unstable

High

Low

Moderate

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

Which not a method for solid waste management>

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Landfill

Incinerating

Recycling

None of these

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

The ozone depletion in the stratophere is mainly due to the reaction of ozone with

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Freons

CFCs

Both A and B

None