Environmental Chemistry Test

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Environmental Chemistry Test - 50

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Weekly Quiz Competition

Question 1
1 / -0

Increasing skin cancer and high mutation rate are the result of _______________.

A
Ozone depletion

B
Acid rain

C
$$CO$$ pollution

D
$$ { CO }_{ 2 } $$ pollution

Solution

Ozone depletion occurs widely in the stratosphere due to an increased amount of $$ { CFC }{ s } $$ which causes various types of skin cancer and mutations.
So, The correct answer is (A)- Ozone depletion.
Question 2
1 / -0

Read the following statements and select the correct option.

Statement 1: Ozone layer present in the stratosphere protects the living organisms from harmful UV rays coming from the sun by absorbing nearly all of them.

Statement 2: Ozone formed in the troposphere by photochemical reactions as a result of human activities which is harmful to all living organisms.

A
Both statements 1 and 2 are correct.

B
Statement 1 is correct but statement 2 is incorrect.

C
Statement 1 is incorrect but statement 2 is correct.

D
Both statements 1 and 2 are incorrect.

Solution

'Good ozone' is found in the upper part of the atmosphere called the stratosphere and it act as a shield by absorbing ultraviolet radiations from the sun. UV rays are, highly injurious to living organisms. 'Bad ozone' is formed in the lower part of atmosphere called troposphere and it harms plants and animals.
Question 3
1 / -0

The major ozone depleting substance out of the following is _____________.

A
$$ { CFC }{ s } $$

B
$$ { O }_{ 2 } $$

C
Nitrogen

D
All of these

Solution

Ozone-depleting substances (ODS) are substances that react with ozone present in the stratosphere and destroy the same. The major Ozone-depleting substances are chlorofluorocarbons (14% of total depletion), nitrogen oxides (3.5% depletion), sulphur dioxide, halon, carbon tetrachloride, methyl chloroform, chlorine, etc.
Question 4
1 / -0

An effective air-pollution control equipment is an attachment that electrically attracts pollutant particles in hot, escaping gases. It is known as:

A
an electric condenser

B
a gas condenser

C
an air purifier

D
an electrostatic precipitator

Solution

Electrostatic precipitator is a device that uses an electric charge to remove certain impurities such as solid particles liquid from air and ether gases. It is particularly used to remove particles and power generating stations.
Question 5
1 / -0

We need fresh air for breathing. Some sources that cause pollution of air are mentioned here. Can you pick the false one?

A
Coal fires

B
Heavy rain

C
Volcanoes

D
Forest fires

Solution

Coal fires, volcanoes and forest fires causes air pollution due to release of many pollutants such as $$CO_2$$, whereas High-speed wind and dust storm cause pollution.
Heavy rain doesn't cause air pollution.
Option B
Question 6
1 / -0

The two strong acids present in the acid rain are:

A
$$HNO_{2}$$ and $$HNO_{3}$$

B
$$H_{2}SO_{4}$$ and $$HNO_{3}$$

C
$$H_{2}SO_{3}$$ and $$H_{2}SO_{4}$$

D
$$H_{2}CO_{3}$$ and $$HCl$$

Solution

Acid rain is caused by emission of nitrogen oxide and sulphur dioxide. These two gases react with water in the atmosphere and oxygen in the air to form sulphuric acid and nitric acid.

$$2 SO_2 + O_2 + 2 H_2 O \rightarrow 2 H_2 SO_4 $$

$$ 4NO_2 + O_2 + 2 H_2 O \rightarrow 4 HNO_3$$
Question 7
1 / -0

Sulphur oxides which are responsible for major air pollution are caused by:

A
burning of coal and refining of pertoleum

B
burning of fuels in automobiles

C
combustion of fuels containing C and H

D
using indoor combustion devices like cooking gas.

Solution

$$SO_2$$ is a major gaseous pollutant found in the lower atmosphere. They are the compounds of sulphur and oxygen molecules. So when the fuels such as coal and oil are burnt, it leads to emission of $$SO_2$$ gas.
Question 8
1 / -0

An object is located at a height of 18 km from the surface of earth. The object is located in:

A
stratosphere

B
mesosphere

C
ionosphere

D
thermosphere

Solution

Below are distances of different layers of Atmosphere from Earth:

Exosphere: It ranges from 700 to 10,000 km (440 to 6,200 miles)

Thermosphere: It ranges from 80 to 700 km (50 to 440 miles)

Mesosphere: It ranges from 50 to 80 km (31 to 50 miles)

Stratosphere: It ranges from 12 to 50 km (7 to 31 miles)

Troposphere: It ranges from 0 to 12 km (0 to 7 miles)

So the correct option is A
Question 9
1 / -0

Which of the following is not an air pollutant?

A
$$H_{2}$$

B
$$SO_{2}$$

C
$$O_{3}$$

D
$$NO_{x}$$

Solution

$$SO_2, O_3, NO_x$$ causes pollution. They are examples of smog or photochemical smog. But $$H_2$$ being a clean fuel does not pollute the air.
Question 10
1 / -0

Which of the following reactions is taking place resulting in discolouration of marble of the buildings like Taj Mahal?

A
$$CaC{ O }_{ 3 }+{ H }_{ 2 }S{ O }_{ 4 }\longrightarrow CaS{ O }_{ 4 }+{ H }_{ 2 }O+C{ O }_{ 2 }$$

B
$$CaC{ O }_{ 3 }+{ H }Cl\longrightarrow CaC{ l }_{ 2 }+{ H }_{ 2 }O+C{ O }_{ 2 }$$

C
$$CaC{ O }_{ 3 }+{ H }_{ 2 }O\longrightarrow Ca{ \left( OH \right) }_{ 2 }+C{ O }_{ 2 }$$

D
$$CaC{ O }_{ 3 }\longrightarrow CaO+C{ O }_{ 2 }$$

Solution

Acid rain is the state when the pH of rain falls below 5.6. Acid rain damages the buildings and statues as they dissolve and corrodes the heavy metals. This happens when sulphuric acid and nitric acids in the polluted air react with calcite in marble, the calcite dissolves. It also dissolves metals from soils, rocks and sediments.

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Re-Attempt Weekly Quiz Competition

Environmental Chemistry Test - 50

Result

Environmental Chemistry Test - 50

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SHARING IS CARING

Question 1

Ozone depletion

Acid rain

$$CO$$ pollution

$$ { CO }_{ 2 } $$ pollution

Solution

Question 2

Both statements 1 and 2 are correct.

Statement 1 is correct but statement 2 is incorrect.

Statement 1 is incorrect but statement 2 is correct.

Both statements 1 and 2 are incorrect.

Solution

Question 3

$$ { CFC }{ s } $$

$$ { O }_{ 2 } $$

Nitrogen

All of these

Solution

Question 4

an electric condenser

a gas condenser

an air purifier

an electrostatic precipitator

Solution

Question 5

Coal fires

Heavy rain

Volcanoes

Forest fires

Solution

Question 6

$$HNO_{2}$$ and $$HNO_{3}$$

$$H_{2}SO_{4}$$ and $$HNO_{3}$$

$$H_{2}SO_{3}$$ and $$H_{2}SO_{4}$$

$$H_{2}CO_{3}$$ and $$HCl$$

Solution

Question 7

burning of coal and refining of pertoleum

burning of fuels in automobiles

combustion of fuels containing C and H

using indoor combustion devices like cooking gas.

Solution

Question 8

stratosphere

mesosphere

ionosphere

thermosphere

Solution

Question 9

$$H_{2}$$

$$SO_{2}$$

$$O_{3}$$

$$NO_{x}$$

Solution

Question 10

$$CaC{ O }_{ 3 }+{ H }_{ 2 }S{ O }_{ 4 }\longrightarrow CaS{ O }_{ 4 }+{ H }_{ 2 }O+C{ O }_{ 2 }$$

$$CaC{ O }_{ 3 }+{ H }Cl\longrightarrow CaC{ l }_{ 2 }+{ H }_{ 2 }O+C{ O }_{ 2 }$$

$$CaC{ O }_{ 3 }+{ H }_{ 2 }O\longrightarrow Ca{ \left( OH \right) }_{ 2 }+C{ O }_{ 2 }$$

$$CaC{ O }_{ 3 }\longrightarrow CaO+C{ O }_{ 2 }$$

Solution

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