Environmental Chemistry Test

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Environmental Chemistry Test - 9

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Weekly Quiz Competition

Question 1
4 / -1

Eutrophication of a lake means, it

A
is low is nutrients

B
is high in nutrients

C
has a high temperature

D
has excess amount of organic matter

Solution

Eutrophication is the process in which lakes receive nutrients such as phosphorus and nitrogen and sediment from the surrounding watershed and become more fertile and shallow.
Question 2
4 / -1

Which one of the following is mainly responsible for depletion of ozone layer?

A
Methane

B
Carbon dioxide

C
Water

D
Chlorofluorocarbons

Solution

Chlorofluorocarbons are responsible for the depletion of ozone layer as they provide Cl free radical which infact reacts with ozone and converts it into O₂ as

Cl^- + O₃→ ClO^- + O₂
Question 3
4 / -1

Photochemical smog is due to the presence of:

A
Oxides of sulphur.

B
Oxides of nitrogen.

C
Oxides of carbon.

D
Chlorofluoro carbons.

Solution

Photochemical smog or Los Angeles type smog is formed in the presence of sunlight when soot particles, hydrocarbons and oxides of nitrogen are present in the atmosphere.

Due to the presence of oxides of nitrogen and ozone, it is oxidising in nature.
Question 4
4 / -1

Which of the following is secondary pollutant?

A
CO₂

B
N₂O

C
PAN

D
SO₂

Solution

Pollutants which are formed by reaction amongst the primary pollutants are called as secondary pollutants e.g., peroxyacyl nitrates (PAN) are formed through reaction between nitrogen oxides and hydrocarbons in the presence of sunlight.
Question 5
4 / -1

In which part of the atmosphere, does the freon remain unchanged?

A
Stratosphere

B
Troposphere

C
Mesosphere

D
Thermosphere

Solution

In stratosphere, freon is able to initiate radical chain reactions that can upset the natural ozone balance.
Question 6
4 / -1

Which one of the following elements, is a component of a compound essential for photosynthesis ?

A
Iron

B
Calcium

C
Barium

D
Magnesium

Solution

Magnesium is found in chlorophyll, the green pigment, essential for photosynthesis.
Question 7
4 / -1

Photochemical oxidants, i.e. PAN or PBN are formed by:

A
action of nitrogen oxides on hydrocarbons in presence of sunlight

B
action of CO₂ on hydrocarbons in presence of sunlight

C
action of hydrogen sulphide on hydrocarbon in presence of sunlight

D
None of the above

Solution
Question 8
4 / -1

Use of chlorofluorocarbons is not encouraged because:

A
they are harmful to the eyes of people that use it

B
they damage the refrigerators and air conditioners

C
they eat away the ozone in the atmosphere

D
they destroy the oxygen layer

Solution

Use of chlorofluoro carbons is not encouraged because they eat away the ozone in the atmosphere. This causes ozone depletion. Also, they are toxic.
Question 9
4 / -1

Alum is a water purifier, because it :

A
coagulates the impurities

B
softens hard water

C
gives taste

D
destroys the pathogenic bacteria

Solution

Alum is a water purifier due to its coagulating power. It precipitates out the colloidal impurities present in water, which may be separated by filteration.
Question 10
4 / -1

Ozone layer is being depleted. This is due to :

A
NO (nitric oxide) emission from supersonic jets

B
chlorofluoro carbon used as aerosols

C
Both (a) and (b)

D
None of the above

Solution

Main reason of O₃ layer depletion is the release of chlorofluorocarbon compounds, called freons and emission of nitric oxide (NO) from supersonic jets

The chlorine free radicals are continuously regenerated and causes the breakdown of ozone.

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Environmental Chemistry Test - 9

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Environmental Chemistry Test - 9

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Question 1

is low is nutrients

is high in nutrients

has a high temperature

has excess amount of organic matter

Solution

Question 2

Methane

Carbon dioxide

Water

Chlorofluorocarbons

Solution

Question 3

Oxides of sulphur.

Oxides of nitrogen.

Oxides of carbon.

Chlorofluoro carbons.

Solution

Question 4

CO2

N2O

PAN

SO2

Solution

Question 5

Stratosphere

Troposphere

Mesosphere

Thermosphere

Solution

Question 6

Iron

Calcium

Barium

Magnesium

Solution

Question 7

action of nitrogen oxides on hydrocarbons in presence of sunlight

action of CO2 on hydrocarbons in presence of sunlight

action of hydrogen sulphide on hydrocarbon in presence of sunlight

None of the above

Solution

Question 8

they are harmful to the eyes of people that use it

they damage the refrigerators and air conditioners

they eat away the ozone in the atmosphere

they destroy the oxygen layer

Solution

Question 9

coagulates the impurities

softens hard water

gives taste

destroys the pathogenic bacteria

Solution

Question 10

NO (nitric oxide) emission from supersonic jets

chlorofluoro carbon used as aerosols

Both (a) and (b)

None of the above

Solution

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CO₂

N₂O

SO₂

action of CO₂ on hydrocarbons in presence of sunlight