Question # 1

Exhaust fumes of cars contain which poisonous gas

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CH₄

C₂H₆

CO

All of these

Natural water is

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Pure

Impure

Acts as solute

Distilled

Which gas produces air pollution?

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oxides of sulphur

oxides of carbon

all of these

Out of total amount of water available for human use is

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0.30%

0.2%

40%

50%

Global warming is mainly caused by ______ radiations

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UV

I.R

gama

X-rays

Residence time of methane in the atmosphere is

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3 - 7 days

2 -3 days

3 - 7 years

2 - 3 years

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

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20%

30%

40%

50%

Lithosphere extends upto kilometer of earth crust in depth:

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10 km

100 km

1000 km

10000 km

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

Density of water becomes maximum at

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10°C

4°C

5°C

12°C

Addition of washing soda removes

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Softness of water

Temporary hardness of water

Permanent hardness of water

Hydrogen from water

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

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Atmosphere

Hydrosphere

Lithosphere

All of these

Which one of the following does not act as pollutant

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Carbon monoxide

Sulphur dioxide

Hydrocarbons

Carbon dioxide

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

Heat balance of earth is maintained by

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Atmosphere

Hydrosphere

Lithosphere

Stratosphere

The layer of earth around the earth is called:

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Atmosphere

Hydrosphere

Lithosphere

Biosphere

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

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

A single chloride free radical can destroy the ozone molecules

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100

100000

10000

10

The smog having high contents of SO₂is

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Neutral smog

Reducing smog

Oxidizing smog

Artificial smog

Chose a point which is not included in the components of environment

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Stratosphere

Hydrosphere

Lithosphere

Biosphere

Fresh water of total earth water is:

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1%

2%

3%

4%

Photo chemical smog contains ______ as main reactants

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Nitrons oxide and unburnt hydrocarbons

Nilric oxide and unburnt hydrocarbons

No and burnt hydrocarbons

N₂O and burnt hydrocarbons

Lead pollution is mainly due to

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Metallic pollution

Space pollution

Acid rain

Cd pollution

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

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paper

plastic

hides of animals

glass

Primary pollutants are:

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oxides of sulphur

oxides of carbon

oxides of nitrogen

All of these

Chromium (VI) is highly toxic and can cause

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Blindness

Cancer

Liver problems

Blood problems

What is the effect of polluted air on environment

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Ozone

Acid rain

Global warming

Smog

Which gas is not a constituent of atmosphere?

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Xe

O₃

H₂

F₂

Troposphere extends upto km:

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0-15 km

10-15 km

15-40 km

A pollutant affects

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Human affects

Quality of life

Functioning of ecosystem

All of these

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

It is a biodegradable pollutant

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Salts of HG

DDt

Aluminum foil

Domestic fuel

Ecology is a science of environment and deals specially with

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stratosphere

biosphere

lithosphere

hydrosphere

The normal amount of overhead ozone is

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350 DU

450 DU

400 DU

300 DU

99.5% mass of lithosphere is made of

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03 elements

8 elements

11 elements

15 elements

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

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

Which of following is primary pollutants

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N₂O

PAN

H₂SO₄

None of these

Cyclone collector is used to reduce

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Noise pollution

Air pollution

Water pollution

Radioactive pollution

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

Detergent greatly effects the

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Aquatic life

Modern life

Terrestrial life

Plants life

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

Water is made disinfectant during purification of water to the step:

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aeration

coagulation

chlorination

treatment

Eleven elements made part of earth mass:

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97.5%

98.5%

99.5%

100%

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

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

In the atmosphere, O₂is about

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10%

15%

21%

25%

Dissolved impurities of potable water can be separated by the process of

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reduction

Aeration

Electrolysis

Co-angulation

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

Which of the following is a macronutrient?

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Boron

Iron

Copper

Carbon

Term ozone hole is used for depletion of ozone during months of:

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Jan-Feb

March - Sep

Sep- Nov

Dec-Feb

Chemicals used to kill fungi are:

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Herbicides

Insecticides

Pesticides

fungicides

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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Ozone layer is high:

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20-23 km

22-25 km

23-26 km

25-28 km

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

Leachate contains:

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fatty acids

Bacteria

Heavy metals

All of these

Which step is unnecessary for purification of water for drinking purposes

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aeration

coagulation

treatment with chlorine

treatment with iodine