Environmental Chemistry Test

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Environmental Chemistry Test - 35

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Weekly Quiz Competition

Question 1
1 / -0

What can reduce the use of pesticides?

A
Use of chemical fertilizers

B
No pest control

C
Growing of weed

D
Biological methods of pest control

Solution
Question 2
1 / -0

Over a number of years the average pH of a stream changes from a pH of 6.9 to a pH of 5.9 due to acid rain. Which statement is true about the pH of the stream?

A
The pH of the stream now is one times more acidic than it was years ago

B
The stream now has 10 times more hydroxide ions than it did years ago

C
The pH of the stream is now 10 times more acidic than it was years ago

D
The stream is more basic now than it was years ago

E
The concentration of hydronium ion in the stream has decreased over the years

Solution

Over a number of years the average pH of a stream changes from a pH of 6.9 to a pH of 5.9 due to acid rain. The pH of the stream is now 10 times more acidic than it was years ago.
Years ago, the pH was 6.9. The present day pH is 5.9. The change in pH is
$$\displaystyle = \Delta pH= 5.9-6.9 = -1$$
The corresponding change in hydrogen ion concentration is:
$$\displaystyle 10^{-\Delta pH}= 10^{-(-1)} = 10$$
Question 3
1 / -0

Mycorrhizal fungi, which form a mutualistic association with many plant roots, are particularly sensitive to the effects of acid rain. These fungi facilitate the absorption of water and nutrients by the plants; in turn, the plants provide sugars and amino acids without which the fungi could not survive.
The relationship between mycorrhizal fungi

A
One partner benefits from the association and the other partner is harmed

B
One partner benefits from the association and the other partner is neither harmed nor helped

C
One partner preys upon the other partner

D
Both partners benefit from the association

E
Neither partner benefits from the association

Solution

Mycorrhizae are the symbiotic fungi that reside in roots of higher plants and increase soil fertility by nitrogen fixation and also increase water and mineral absorption by plant roots. Fungi are beneffited by this association as they get sugar and amino acids. Both partners are benefitted; association is symbiosis.
Therefore, the correct answer is option D.
Question 4
1 / -0

Chlorofluorocarbons cause

A
Global warming

B
Eutrophication of lakes

C
Depletion of the ozone layer

D
Magnification in the food chain

E
Acid rain

Solution

Chlorofluorocarbons (CFC) also known as freons which cause a destruction of ozone layer found in the stratospheric layer. The ozone layer in the atmosphere prevents the harmful UV rays from reaching the earth surface. When this ozone layer gets depleted, harmful UV rays causes skin cancer.
Question 5
1 / -0

Identify the correct statements about acid rain.
I. Acid rain is caused by nitric acid and sulfuric acid.
II. Acid rain can damage plants directly.
III. Acid rain can cause magnesium and calcium to be leached from the soil.

A
I only

B
II only

C
III only

D
Both II and III

E
All of the above

Solution

Acid Rain is any form of precipitation with acidic components, such as sulfuric or nitric acid that fall to the ground from the atmosphere in wet or dry forms.
It can have harmful effects on plants, aquatic animals and infrastructure. It weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil.
Soil chemistry can be dramatically changed when base cations, such as calcium and magnesium, are leached by acid rain thereby affecting sensitive species. Hence, the correct answer is option D.
Question 6
1 / -0

Which of the following statements is true about acid rain?

A
Acid rain will erode marble statues

B
Acid rain can change the pH of lakes and streams

C
Acid rain can be formed from carbon dioxide

D
Acid rain creates holes in the ozone layer

E
All of the above

Solution

Acid rain is caused due to oxides of nitrogen and sulphur reacting with water, oxygen, carbon dioxide, and other chemicals present high in the atmosphere resulting into acidic pollutants.
As a result of this, $$pH$$ of rainwater lowers down to $$5$$ resulting in $$pH$$ change of lakes and streams.
It also reacts with calcium carbonate present in the marbles causing weathering.
The oxides of sulphur may also react with $$O_3$$ present in ozone, thus depleting the ozone layer. Hence all the given statements are correct
Question 7
1 / -0

In the gases below, which would react with rain water to produce acid rain?
i. CFCs
ii. Methane
iii. Carbon dioxide

A
i only

B
ii only

C
iii only

D
i and iii only

E
i, ii and iii
Solution
Carbon dioxide would react with rainwater to produce acid rain.

The reaction of carbon dioxide with water gives carbonic acid.

$$\displaystyle CO_2 + H_2O \rightarrow H_2CO_3 $$
Hence the correct option is C.
Question 8
1 / -0

Which of the following gas is used in bleaching of paper?

A
Hydrogen peroxide

B
Sulphur dioxide

C
Methane

D
None of the above

Solution

Alkaline hydrogen peroxide is used as a strong bleaching agent due to the oxidation state of $$-1$$ in the compound.
Question 9
1 / -0

Which of the following is the result of use of chlorofluorocarbons?

A
Global warming

B
Eutrophication of lates

C
Depletion of the ozone layer

D
Magnification in the food chain

E
Acid rain

Solution

A chlorofluorocarbon (CFC) is composed of carbon, chlorine, and fluorine. This is used in refrigerants, propellants, and solvents. The chlorine atoms are released due to splitting of CFC by ultravoilet radiation.
So, the correct answer is option C.
Question 10
1 / -0

Increased $$SO_2$$ concentration in the air causes

A
Global warming

B
Eutrophication of lakes

C
Depletion of the ozone layer

D
Magnification of the ozone layer

E
Acid rain

Solution

Acid rain is the result of increased sulphur and nitrogen oxide levels in the atmosphere. When nitrogen oxides and sulfur dioxide reacts with water, oxygen and other chemicals forms nitric acid and sulfuric acid which then mix with rainwater and causes acid rain. Thus, the correct answer is option E.

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Re-Attempt Weekly Quiz Competition

Environmental Chemistry Test - 35

Result

Environmental Chemistry Test - 35

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SHARING IS CARING

Question 1

Use of chemical fertilizers

No pest control

Growing of weed

Biological methods of pest control

Solution

Question 2

The pH of the stream now is one times more acidic than it was years ago

The stream now has 10 times more hydroxide ions than it did years ago

The pH of the stream is now 10 times more acidic than it was years ago

The stream is more basic now than it was years ago

The concentration of hydronium ion in the stream has decreased over the years

Solution

Question 3

One partner benefits from the association and the other partner is harmed

One partner benefits from the association and the other partner is neither harmed nor helped

One partner preys upon the other partner

Both partners benefit from the association

Neither partner benefits from the association

Solution

Question 4

Global warming

Eutrophication of lakes

Depletion of the ozone layer

Magnification in the food chain

Acid rain

Solution

Question 5

I only

II only

III only

Both II and III

All of the above

Solution

Question 6

Acid rain will erode marble statues

Acid rain can change the pH of lakes and streams

Acid rain can be formed from carbon dioxide

Acid rain creates holes in the ozone layer

All of the above

Solution

Question 7

i only

ii only

iii only

i and iii only

i, ii and iii

Solution

Question 8

Hydrogen peroxide

Sulphur dioxide

Methane

None of the above

Solution

Question 9

Global warming

Eutrophication of lates

Depletion of the ozone layer

Magnification in the food chain

Acid rain

Solution

Question 10

Global warming

Eutrophication of lakes

Depletion of the ozone layer

Magnification of the ozone layer

Acid rain

Solution

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