Environmental Chemistry Test

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Environmental Chemistry Test - 19

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Weekly Quiz Competition

Question 1
1 / -0

Photochemical smog is related to the pollution of

A
Soil

B
Water

C
Noise

D
Air

Solution

Smog is the secondary air pollutant. Smog is opaque or dark fog having condensed water vapours, dust, smoke and gases like sulphur dioxide, hydrogen sulphide, nitrogen oxides etc. Smog can be classical or photochemical. Classical smog has the reducing environment. Photochemical smog is yellowish brown opaque smog having an oxidising environment with a little smoke. Photochemical smog contains secondary pollutants of photochemical oxidants.
Question 2
1 / -0

What are the chief pollutants of the atmosphere, which are most likely to deplete the ozone layer?

A
Sulphur dioxide

B
Nitrogen oxide and Fluorocarbons

C
Carbon dioxide

D
Carbon monoxide

Solution

Chlorofluorocarbons or Chlorofluoromethane are also known as freon or aerosols. They are chemicals used as refrigerants, propellants and solid plastic foams. These chemicals are also released as aerosols by jets flying at high altitudes. Along with nitrogen oxides, chlorofluorocarbons react with ozone of ozonosphere and depletes the same. Chlorofluorocarbons release reactive chloride which directly reacts with ozone molecules setting a chain reaction.
So, the correct answer is option B.
Question 3
1 / -0

Acid rain is caused due to increase in concentration of (in atmosphere)

A
$$SO_2$$ and $$NO_2$$

B
CO and $$CO_2$$

C
CO and $$SO_3$$

D
$$O_3$$ and dust

Solution

Acid rain is rainfall and other forms of precipitation with a pH less than 5. Acid rain is caused by large scale emission of acidic gases into the atmosphere from thermal power plants, industries, and automobiles. The common ones are sulphur dioxide, nitrogen oxides, volatile organic carbons and hydrogen chloride. These oxides combine with water to form acids.
So, the correct answer is option A.
Question 4
1 / -0

In coming years, skin related disorders will be more common due to:

A
Pollutants in air

B
Use of detergents

C
Water pollution

D
Depletion of ozone layer

Solution

Thinning of the ozone layer increases the number of ultraviolet radiations reaching the earth surface. The increased UV-B radiation increases the incidence of cataract, skin cancers herpes, dimming of eyesight, photo burning, snow blindness and deficient functioning of the immune system.
Question 5
1 / -0

Acid rain is the secondary effect of

A
Water pollution

B
Air pollution

C
Soil pollution

D
Sound pollution

Solution

Acid rain is the secondary effect of air pollution. The gases like sulphur dioxide and nitrogen oxide when in high concentration in the air, mix with the air moisture in clouds and form sulphuric and nitric acids. These acids come down to the earth in the form of acid rain causing much damage to the living organism (plants, animals) and buildings.
Thus, the correct answer is option B.
Question 6
1 / -0

Which of the following is not used as a bio pesticide ?

A
Xanthomonas Campestris

B
Bacillus thringiensis

C
Trichoderma harzianum

D
Nuclear Polyhedral Virus (NPV)

Solution
Question 7
1 / -0

Which one of the following gases can deplete ozone layer in the upper atmosphere?

A
Ammonia

B
Methane

C
Carbon monoxide

D
None of the above

Solution

Methane can deplete ozone layer in the upper atmosphere. It acts as a greenhouse gas (a gas that traps heat from the sun within earth’s atmosphere) and it also attacks ozone. At low latitudes, methane in the stratosphere breaks down into hydrogen oxides, which attack reaching the ozone layer reacts with it and leads to the splitting of bonds between ozone.
So, the correct answer is option B.
Question 8
1 / -0

Which of the following group of gases cause photochemical smog?

A
$$O_3$$, PAN and CO

B
HC, NO and PAN

C
$$O_2$$, PAN and $$NO_2$$

D
$$O_2$$, PAN and $$NO_3$$

E
$$O_3$$, PAN and $$NO_2$$

Solution

Photochemical smog is grey or yellowish brown opaque smog having an oxidising environment with a little smoke. Photochemical smog contains secondary pollutants or photochemical oxidants like nitrogen oxide, ozone, peroxyacetyl nitrates or PAN, aldehydes and phenols produced due to photochemical reactions between nitrogen oxides and unsaturated hydrocarbons. Thus, the correct answer is option E.
Question 9
1 / -0

Green chemistry means such reactions that:

A
are related to the depletion of ozone layer

B
study the reactions in plants

C
produce colour during reactions

D
reduce the use and production of hazardous chemicals

Solution

Green chemistry means chemistry that uses less harmful and hazardous chemicals products that does not cause any harm neither to us nor to the environment.
Question 10
1 / -0

Herbicides prevent?

A
Water reabsorption

B
Photolysis of water

C
Transpiration

D
Respiration

Solution

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Environmental Chemistry Test - 19

Result

Environmental Chemistry Test - 19

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SHARING IS CARING

Question 1

Soil

Water

Noise

Air

Solution

Question 2

Sulphur dioxide

Nitrogen oxide and Fluorocarbons

Carbon dioxide

Carbon monoxide

Solution

Question 3

$$SO_2$$ and $$NO_2$$

CO and $$CO_2$$

CO and $$SO_3$$

$$O_3$$ and dust

Solution

Question 4

Pollutants in air

Use of detergents

Water pollution

Depletion of ozone layer

Solution

Question 5

Water pollution

Air pollution

Soil pollution

Sound pollution

Solution

Question 6

Xanthomonas Campestris

Bacillus thringiensis

Trichoderma harzianum

Nuclear Polyhedral Virus (NPV)

Solution

Question 7

Ammonia

Methane

Carbon monoxide

None of the above

Solution

Question 8

$$O_3$$, PAN and CO

HC, NO and PAN

$$O_2$$, PAN and $$NO_2$$

$$O_2$$, PAN and $$NO_3$$

$$O_3$$, PAN and $$NO_2$$

Solution

Question 9

are related to the depletion of ozone layer

study the reactions in plants

produce colour during reactions

reduce the use and production of hazardous chemicals

Solution

Question 10

Water reabsorption

Photolysis of water

Transpiration

Respiration

Solution

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