Environmental Chemistry Test

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Environmental Chemistry Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

What measure do farmers use to control soil acidity?

A
Farmers use pesticides

B
Farmers use chemical fertilizers

C
Farmers use borax

D
Farmers use limestone

Solution

Soil acidity is often increased by the use of the large amounts of fertiliser needed for the potato crop in this region. To control soil acidity, farmers apply ground limestone to the soil, and then mix it in with tillage implements. Therefore, the correct answer is option D.
Question 2
1 / -0

What occurs when acidic oxides generated of carbon, nitrogen and sulphur due to burning of fossil fuels come in contact of rain?

A
Acid rain

B
Basic Rain

C
Normal Rain

D
Hailstorms

Solution

Acid rains are caused when the pollutants such as sulphur dioxide and nitrous oxide formed due to the burning of the fossil fuels are released in the atmosphere, where they travel upwards and mixes with oxygen, air and moisture to form pollutants called acidic oxide pollutants.
Question 3
1 / -0

Ozone is present as a chief constituent in which region of the atmosphere?

A
Troposphere

B
Stratosphere

C
Mesosphere

D
Thermosphere

Solution

The stratosphere is a second layer of Earth's atmosphere. The troposphere, the lowest layer, is right below the stratosphere. The next higher layer above the stratosphere is the mesosphere.
Ozone is a three oxygen molecule that are abundant in the stratosphere, it absorbs energy from incoming ultraviolet radiation from the Sun.
Question 4
1 / -0

The increase in temperature on the earth disturbs the water cycle and reduces rainfall. The situation may lead to:

A
floods

B
droughts

C
increased level of $${CO_2}$$

D
all of the above

Solution

The increase in temperature on the earth (due to deforestation - cutting down of trees) disturbs the water cycle and reduces rainfall. The situation may lead to droughts (high scarcity of water).
Question 5
1 / -0

In which of the following year, the depletion of the ozone layer have been noticed?

A
1979

B
1980

C
1981

D
1982

Solution

The depletion of the ozone layer was noticed in the year 1980.
The large scale destruction of the stratospheric ozone first came into focus in 1987 through the experiments in antarctica.
Question 6
1 / -0

What happen when the destruction of the ozone layer increases?

A
The amount of harmful ultraviolet radiation

B
The amount of needful ultraviolet radiation

C
The amount of ultra radiations

D
None of these

Solution

When the destruction of the ozone layer increases, the amount of harmful ultraviolet radiation increases.
Note:
Ozone layer acts as natural sun block and shields us from the UV radiations of the sun which are dangerous to living organisms.
The ozone molecules absorb ultraviolet rays between 310 to 200 nm wavelength.
Ozone absorbs UV radiation to give back oxygen. Thus, the ozone layer acts as a screen and prevents the harmful radiations from reaching the surface of earth.
Question 7
1 / -0

Rain, snow or fog which is acidic in nature, is known as:

A
acid rain

B
acid snow

C
acid fog

D
all of the above

Solution

Acid rain includes any form of precipitation with acidic components from the atmosphere.
This can include rain, snow, fog, hail, or even dust that is acidic.
This happens when oxides of sulfur and nitrogen that are emitted by the industries react with water and oxygen in the atmosphere to form sulphuric acid and nitric acid respectively.
These acids are responsible for the acidic nature of the rains. Their $$pH$$ is usually between $$5.5$$ to $$5$$.
Thus, the correct option is A.
Question 8
1 / -0

Which of the following is not an objective of Green chemistry?

A
It is better to prevent waste than to treat or clean up waste after it has been created.

B
The use of auxiliary substances (e.g., solvents, separation agents, etc.) should be made unnecessary wherever possible and innocuous when used.

C
Energy requirements of chemical processes should be recognized for their environmental and economic impacts and should be minimized. If possible, synthetic methods should be conducted at ambient temperature and pressure.

D
None of the above

Solution

All the three are objectives of Green chemistry.
1. Waste Prevention:
It is better to prevent waste than to treat or clean up waste after it has been created.
2. Safer Solvents and Auxiliaries:
The use of auxiliary substances (e.g., solvents, separation agents, etc.) should be made unnecessary wherever possible and innocuous when used.
3. Design for Energy Efficiency:
Energy requirements of chemical processes should be recognized for their environmental and economic impacts and should be minimized. If possible, synthetic methods should be conducted at ambient temperature and pressure.
Question 9
1 / -0

Cutting of trees decreases:

A
pollution level

B
temperature

C
fertility of soil

D
carbon dioxide level

Solution

Deforestation means cutting of trees. It is a major cause which leads to the change in soil properties. The nutrients are not replenished in the soil and the roots cannot hold the fertile soil in a place, leading to erosion.
Deforestation also result in an increase of pollution level, temperature and carbon dioxide level.
Question 10
1 / -0

The full form of LDPE is low-density polyester, which is monomer of first grade _______ unit.

A
ester

B
alcohol

C
ether

D
phenol

Solution

Low-density polyethylene (LDPE) is a thermoplastic made from the monomer ethylene. It was the first grade of polyethylene, produced in 1933 by Imperial Chemical Industries (ICI) using a high pressure process via free radical polymerization. Its manufacture employs the same method today.

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Re-Attempt Weekly Quiz Competition

Environmental Chemistry Test - 13

Result

Environmental Chemistry Test - 13

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SHARING IS CARING

Question 1

Farmers use pesticides

Farmers use chemical fertilizers

Farmers use borax

Farmers use limestone

Solution

Question 2

Acid rain

Basic Rain

Normal Rain

Hailstorms

Solution

Question 3

Troposphere

Stratosphere

Mesosphere

Thermosphere

Solution

Question 4

floods

droughts

increased level of $${CO_2}$$

all of the above

Solution

Question 5

1979

1980

1981

1982

Solution

Question 6

The amount of harmful ultraviolet radiation

The amount of needful ultraviolet radiation

The amount of ultra radiations

None of these

Solution

Question 7

acid rain

acid snow

acid fog

all of the above

Solution

Question 8

It is better to prevent waste than to treat or clean up waste after it has been created.

The use of auxiliary substances (e.g., solvents, separation agents, etc.) should be made unnecessary wherever possible and innocuous when used.

Energy requirements of chemical processes should be recognized for their environmental and economic impacts and should be minimized. If possible, synthetic methods should be conducted at ambient temperature and pressure.

None of the above

Solution

Question 9

pollution level

temperature

fertility of soil

carbon dioxide level

Solution

Question 10

ester

alcohol

ether

phenol

Solution

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