Question # 1

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

Chlorofluorocarbons and aerosols are inert in sphere:

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troposphere

stratosphere

lithosphere

hydrosphere

Water bodies are included in:

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Atmosphere

Hydrosphere

Lithosphere

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

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

Smaller unit of biosphere is:

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specie

ecosystem

plankton

troposphere

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

Density of water becomes maximum at

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10°C

4°C

5°C

12°C

Lithosphere has amount of silicon

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35.30%

27.72%

40.01%

21.13%

Polar ice caps can melt due to

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Acid rain

Green House Effect

Smog

Chlorofluorocarbons

BOD is the oxygen demand with in day(s):

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Four

Two

Three

Five

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

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

Eleven elements made part of earth mass:

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97.5%

98.5%

99.5%

100%

Chloroform is carcinogenic:

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Heart

Lungs

Liver

Kidney

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

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aeration

coagulation

chlorination

treatment

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

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low

least

medium

High

The region of earth capable of supporting life is

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Hydrosphere

Lithosphere

Biosphere

Atmosphere

Newspaper can be recycled again and again by how many times?

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2

3

4

5

Test of incomplete combustion of petrol in the presence of

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CO₂

SO₂

NO₂

Co

Carbon Monoxide is:

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colouriess

orderless

high toxic

All of these

Hydrosphere covers the surface of erath:

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70.8%

71.8%

72.8%

73.8%

Which gas is not a constituent of atmosphere?

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Xe

O₃

H₂

F₂

Chlorination of water is effective for

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Killing pathogens

Removing dust

Removing hardness

Increasing oxygen content

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