Environmental Chemistry Test

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Environmental Chemistry Test - 31

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Weekly Quiz Competition

Question 1
1 / -0

Smog is often caused by :

A
heavy traffic

B
high temperatures

C
calm winds

D
all of the above

Solution

Smog is often caused by heavy traffic, high temperatures, sunshine and calm winds.
Question 2
1 / -0

Which are the following consequences of deforestation?

A
Decrease in rainfall

B
Decrease in fertility of soil

C
Increased global warming

D
All of the above

Solution

All of the following are the consequences of deforestation.
(A) Decrease in rainfall
(B) Decrease in fertility of soil
(C) Increased global warming
Cutting of trees reduces amount of rainfall, it also decreases the fertility of soil. Deforestation increases the temperature and carbon dioxide level thus causing increased global warming.
Question 3
1 / -0

Non-metal oxides such as sulphur dioxide and nitrogen oxide are responsible for:

A
ozone depletion

B
water pollution

C
acid rain

D
all of the above
Question 4
1 / -0

Smog causes :

A
pulmonary disease

B
eye irritation

C
pneumonia

D
All of the above

Solution

Smog can be responsible for any ailment from minor pains to deadly pulmonary diseases such as lung cancer. Smog is well known for causing irritation in the eye. It may also result in inflammation in the tissues of lungs, giving rise to pain in the chest. Other issues or illnesses such as cold and pneumonia are also related to smog. The human body faces great difficulty in defending itself against the harmful effects of smog.
Question 5
1 / -0

Which ions among the following are present in elevated amounts in acid rains?

A
Calcium ions

B
Carbonate ions

C
Hydrogen ions

D
Hydroxide ions

Solution

Acid rain is acidic in nature.

Hydrogen ion is the characteristic ion present in any acids.

Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it has elevated levels of hydrogen ions.

Hence hydrogen ions are present in elevated amounts in it.

Option C is correct.
Question 6
1 / -0

Which of the following describes the destruction of the ozone by chlorofluorocarbons?

A
CFC contains the chlorine molecule which reacts with ozone (O$$_2$$) molecule and splits into O$$_2$$ and O molecules

B
Contains the chlorine molecule which reacts with oxygen (O$$_3$$) molecule and splits into O$$_2$$ and O molecules

C
CFC contains the fluorine molecule which reacts with ozone (O$$_3$$) molecule and splits into O$$_2$$ and O molecules

D
CFC contains the chlorine molecule which reacts with ozone (O$$_3$$) molecule and splits into O$$_2$$ and O molecules

Solution

The correct answer is 'CFC contains the chlorine molecule which reacts with ozone molecule and splits into O2 and nascent O or Oxygen free radical. The choline is split by the action of sunlight and it causes the reaction move forward.
Question 7
1 / -0

Depletion of ozone layer is mainly due to

A
Methane

B
Carbon dioxide

C
Chloroflorocarbons

D
Nitrogen

Solution

Depletion of ozone layer is mainly due to Chloroflorocarbons.
Note:
The following describes the destruction of the ozone by chlorofluorocarbons.
Chlorofluorocarbons contains the chlorine molecule which reacts with ozone (O$$_3$$) molecule and splits into O$$_2$$ and O molecules.
Chlorofluorocarbons are used in refrigerators, air conditioners and aerosol sprays. They damage the ozone layer of the atmosphere.
Question 8
1 / -0

_____ shields the surface of the earth from ultraviolet (UV) radiation from the sun.

A
Oxygen

B
Nitrogen

C
Ozone

D
Carbon dioxide

Solution

Ozone shields the surface of the earth from ultraviolet (UV) radiation from the sun. Ozone layer reduces the chances of skin cancer.
Question 9
1 / -0

Which of the following conditions lead to formation of ozone?

A
When oxygen molecules absorb ultraviolet photons and undergo photolysis

B
When carbon molecules absorb ultraviolet photons and undergo photolysis

C
When oxygen molecules absorb ultraviolet electrons and undergo photolysis

D
When oxygen molecules absorb ultraviolet neutrons and undergo photolysis

Solution

When oxygen molecules absorb ultraviolet photons and undergo photolysis, ozone is obtained
$$3O_2 \xrightarrow [photolysis]{UV \: light} 2O_3$$.
Question 10
1 / -0

The main factor responsible for the depletion of ozone layer is addition of _____in the atmosphere.

A
$$Mn$$

B
$$Cl$$

C
$$Na$$

D
$$Co$$

Solution

The main factor responsible for the depletion of ozone layer is addition of Cl in the atmosphere.
Each Cl atom can destroy as many as 100,000 ozone molecules. Cl atoms comes from chlorofluorocarbons.

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Environmental Chemistry Test - 31

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Environmental Chemistry Test - 31

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SHARING IS CARING

Question 1

heavy traffic

high temperatures

calm winds

all of the above

Solution

Question 2

Decrease in rainfall

Decrease in fertility of soil

Increased global warming

All of the above

Solution

Question 3

ozone depletion

water pollution

acid rain

all of the above

Question 4

pulmonary disease

eye irritation

pneumonia

All of the above

Solution

Question 5

Calcium ions

Carbonate ions

Hydrogen ions

Hydroxide ions

Solution

Question 6

CFC contains the chlorine molecule which reacts with ozone (O$$_2$$) molecule and splits into O$$_2$$ and O molecules

Contains the chlorine molecule which reacts with oxygen (O$$_3$$) molecule and splits into O$$_2$$ and O molecules

CFC contains the fluorine molecule which reacts with ozone (O$$_3$$) molecule and splits into O$$_2$$ and O molecules

CFC contains the chlorine molecule which reacts with ozone (O$$_3$$) molecule and splits into O$$_2$$ and O molecules

Solution

Question 7

Methane

Carbon dioxide

Chloroflorocarbons

Nitrogen

Solution

Question 8

Oxygen

Nitrogen

Ozone

Carbon dioxide

Solution

Question 9

When oxygen molecules absorb ultraviolet photons and undergo photolysis

When carbon molecules absorb ultraviolet photons and undergo photolysis

When oxygen molecules absorb ultraviolet electrons and undergo photolysis

When oxygen molecules absorb ultraviolet neutrons and undergo photolysis

Solution

Question 10

$$Mn$$

$$Cl$$

$$Na$$

$$Co$$

Solution

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