Environmental Chemistry Test

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Environmental Chemistry Test - 72

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is the uppermost layer of the atmosphere?

A
Stratosphere

B
Mesosphere

C
Ionosphere

D
Exosphere

Solution
Question 2
1 / -0

Which of the following practices will not come under green chemistry?

A
If possible, making use of soap made of vegetable oils instead of using synthetic detergents.

B
Using $$H_{2}O_{2}$$ for bleaching purpose instead of using chlorine based bleaching agents.

C
Using bicycle for travelling small distances instead of using petrol/diesel based vehicles.

D
Using plastic cans for neatly storing substances.

Solution

Green chemistry is the different process and methods that helps in minimizing the effects of pollution and eliminating the hazardous substances. It takes care that no products adds to the environmental pollution. So using plastic cans does not come under green chemistry.
Question 3
1 / -0

Which of the following practices involve green chemistry?
(i) Substitute CFCs by environmental friendly HFCs and other compounds.
(ii) Replace halogenated solvent by liquid $$CO_{2}$$ for drycleaning.
(iii) Use of $$H_{2}O$$ for bleaching instead of $$Cl_{2}$$
(iv) Making disposable eating utensils and storage jars of plastics.

A
(i) and (ii)

B
(ii) and (iv)

C
(iii) and (iv)

D
(i), (ii) and (iii)

Solution

Green chemistry is defined as chemistry for an environment which involves less use of hazardous substances. Its purpose is to discover new techniques to make the best chemical product. It is basically using a set of principles and preventing the use of harmful substances.
Plastics and disposals are non-biodegradable materials which can cause harmful effect in the environment.
Question 4
1 / -0

Which of the following practices will come under green chemistry?

A
If possible, making use of soap made of vegetable oils instead of using synthetic detergents

B
Using $$H_{2}O$$ for bleaching purpose instead of using chlorine based bleaching agents

C
Using bicycle for travelling small distances instead of using petrol/diesel based vehicles

D
All of these

Solution

Green chemistry is process and methods that helps in minimizing the effects of pollution and eliminates the use of harmful and hazardous substances. So all the above mentioned practice comes under the practices developed by the greenhouse chemistry.
Question 5
1 / -0

Temperature of troposphere decreases with altitude. This is because of_____.

A
high pressure of air

B
gases present in air

C
low density of air

D
all of these

Solution

Generally, temperatures decrease with increasing height because the atmosphere distributes itself according to gravity.

In the troposphere, the temperature generally decreases with altitude. The reason is the troposphere's gases absorb very little of the incoming solar radiation. Instead, the ground absorbs this radiation and then heats the tropospheric air by conduction and convection.
Question 6
1 / -0

Air contains $$79$$% $${N}_{2}$$ and $${21}$$% $${O}_{2}$$ by volume. If the barometric pressure is $$750mm$$ $$Hg$$ the partial pressure of oxygen is:
($$d{N}_{2}=1.25, d{O}_{2}=1.42g/m$$)

A
$$157.5mm$$ of $$Hg$$

B
$$175.5mm$$ of $$Hg$$

C
$$315.0mm$$ of $$Hg$$

D
None

Solution

You can easily calculate the partial pressure of oxygen keeping in mind the definition of partial pressure.

First of all You have the find out the mole fraction of the oxygen and we know that mole fraction can be calculated from percentage composition of the gas divided by the total percentage of all gases
So here oxygen is 21% = mole fraction of 21 % oxygen $$=\dfrac{21}{100} = 0.21$$
Here total pressure is give which is $$=750$$ mm of $$Hg$$

Partial pressure of oxygen will be $$= 750\times 0.21 = 157.5 \,mm \,of\, Hg$$.
So partial pressure of oxygen will be $$157.5 \,mmHg$$
Question 7
1 / -0

Choose the correct match

A
Classical smog$$ \to S{O_2}$$

B
Photo-chemical smog $$ \to PAN + {O_3}$$

C
Green house effect $$ \to CFC$$

D
Eutrophication $$ \to DDT$$
Solution
Correct Option: A
Explanation:
- A typical classical smog is found in areas that have a humid climate.
- It is a mixture of smoke, sulphur dioxide (SO2) and fog.
- Photochemical smog is produced when the UV rays from the sun react with nitrogen dioxide.
- Greenhouse gases include carbon dioxide, water vapours, methane and nitrous oxide, ozone and CFCs.
- Eutrophication is the ageing of the aquatic lake
Hence, the correct pair is Classic smog→ SO2
Question 8
1 / -0

Which of the following are main responsible for ozone depletion?

A
Chlorofluorocarbons

B
Hydrocarbons

C
Carbon monoxide

D
Carbon dioxide
Solution
- Ozone depletion occurs when chlorofluorocarbons (CFCs) present in aerosols and refrigerants are released into the stratosphere.
- Ultraviolet radiations from the sun break these CFCs molecules and release the chlorine atoms.
- Chlorine atom reacts with the ozone (O₃) molecules and starts the ozone destruction cycle.
- So, the correct answer is 'Chlorofluorocarbons'.
Question 9
1 / -0

Region/regions of the atmosphere where temperature decreases with altitude is/are:

A
thermosphere

B
stratosphere

C
troposphere

D
ozonosphere

Solution

The temperature decreases with the altitude (height) in the lowest 10-20km of the atmosphere called the Troposphere because most of the solar radiation passes through the atmosphere with little or no effect. That radiation is observed by the solid earth surface and is transferred to the air above the surface by conduction.
Question 10
1 / -0

Read the following statements
A) High concentration of $${ SO }_{ 2 }$$ in air leads to stiffness of flower buds and fall off from plants.
B) pH of acid rain is less than 5.6.
C) Photochemical smog occurs in cool humid climate.
Correct statements are

A
A,B and C

B
A & C

C
B & C

D
A & B

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Environmental Chemistry Test - 72

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Environmental Chemistry Test - 72

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Question 1

Stratosphere

Mesosphere

Ionosphere

Exosphere

Solution

Question 2

If possible, making use of soap made of vegetable oils instead of using synthetic detergents.

Using $$H_{2}O_{2}$$ for bleaching purpose instead of using chlorine based bleaching agents.

Using bicycle for travelling small distances instead of using petrol/diesel based vehicles.

Using plastic cans for neatly storing substances.

Solution

Question 3

(i) and (ii)

(ii) and (iv)

(iii) and (iv)

(i), (ii) and (iii)

Solution

Question 4

If possible, making use of soap made of vegetable oils instead of using synthetic detergents

Using $$H_{2}O$$ for bleaching purpose instead of using chlorine based bleaching agents

Using bicycle for travelling small distances instead of using petrol/diesel based vehicles

All of these

Solution

Question 5

high pressure of air

gases present in air

low density of air

all of these

Solution

Question 6

$$157.5mm$$ of $$Hg$$

$$175.5mm$$ of $$Hg$$

$$315.0mm$$ of $$Hg$$

None

Solution

Question 7

Classical smog$$ \to S{O_2}$$

Photo-chemical smog $$ \to PAN + {O_3}$$

Green house effect $$ \to CFC$$

Eutrophication $$ \to DDT$$

Solution

Question 8

Chlorofluorocarbons

Hydrocarbons

Carbon monoxide

Carbon dioxide

Solution

Question 9

thermosphere

stratosphere

troposphere

ozonosphere

Solution

Question 10

A,B and C

A & C

B & C

A & B

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