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CBSE Questions for Class 6 Chemistry Air Around Us Quiz 4 - MCQExams.com
CBSE
Class 6 Chemistry
Air Around Us
Quiz 4
Choose the correct alternative from the choice given for the following statements:
Air consists of:
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0%
oxygen
0%
nitrogen
0%
carbon dioxide
0%
All of these
Explanation
Answer is Option D.
Air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon and hydrogen.
Write 'true' or 'false':
The composition of air was discovered by Lavoisier.
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0%
True
0%
False
Explanation
In June $$1783$$, Lavoisier reacted oxygen with inflammable air, obtaining "water in a very pure state." He correctly concluded that water was not an element but a compound of oxygen and inflammable air, or hydrogen as it is now known. To support his claim, Lavoisier decomposed water into oxygen and inflammable air.
So, the given statement is false.
State whether the following statement are 'true' or 'false'. If 'false' write the correct statement:
Air is a mixture and not a compound since the components of air cannot be separated by physical methods.
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0%
True
0%
False
Explanation
$$False$$
Air is a mixture and not a compound since the components of air can be separated by physical methods.
Which of the following is common in combustion and aerobic respiration?
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0%
require oxygen
0%
release of heat and light
0%
both are natural process
0%
require nitrogen
Explanation
During the process of combustion and aerobic respiration:
1. Oxidation takes place in the presence of oxygen.
2. Liberation of energy.
The release of heat and light is mostly limited to combustion.
Respiration is a natural process whereas combustion can be either be a natural process or done by human efforts. Both combustion and aerobic respiration don't require nitrogen.
Hence, the requirement of oxygen is common in both combustion and respiration.
The component which is not present in air is?
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0%
Nitrogen
0%
Oxygen
0%
Carbon dioxide
0%
Chlorine
Explanation
Air does not contain chlorine. It is a mixture of other gases like nitrogen, oxygen, carbon dioxide, helium, hydrogen, argon, etc.
Which is the most abundant gas in the atmosphere?
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0%
$$ Oxygen $$
0%
$$ Nitrogen $$
0%
$$ Carbon dioxide $$
0%
$$ Other \ gases $$
Explanation
The
air
in Earth's atmosphere is made up of approximately $$78$$% nitrogen and $$21$$% oxygen.
Air
also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen
Hence answer is $$ Nitrogen $$
Carbon dioxide gas is lighter than air.
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0%
True
0%
False
Explanation
Carbon dioxide gas is heavier than air.
The Molecular weight and therefore the density (at the same temperature and pressure) of CO2 is only marginally higher than the average density of air.
Identify the gas "odourless, colourless, heavier than air, supports combustion".
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0%
Nitrogen
0%
Oxygen
0%
Carbondioxide
0%
Water vapour
Explanation
Oxygen is a
colorless
,
odorless,
and tasteless
gas
that
supports
life and
combustion and heavier than air.
hence the correct answer is B
Mark the given statement as true or false:
Oxygen gas is necessary for respiration.
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0%
True
0%
False
The pie chart shows the different gases that contribute to the total composition of air.
What atmospheric gas does the area marked as R in the pie chart represent?
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0%
Nitrogen
0%
Carbon dioxide
0%
Oxygen
0%
Water vapour
Explanation
The area marked as R shows the atmospheric gas-Nitrogen. Nitrogen is the most abundant gas. It comprises about $$78.08\%$$ of our atmosphere thus comprising the most about of our atmosphere.
Which gas present in atmosphere allows substance to burn?
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0%
Nitrogen
0%
Carbon dioxide
0%
Oxygen
0%
Ozone
Explanation
The gas which allows the substances to burn in the air is oxygen. Oxygen supports burning and is an essential component for burning.
Hence, option C is correct.
Air is a ______.
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0%
Mixture
0%
Compound
0%
Pure substance
0%
None of these
State whether the statement is true or false:
Water vapour is present in air only during the monsoon.
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0%
True
0%
False
Explanation
The given statement is $$\text {False}$$.
Some amount of water vapors are present in all seasons. It may be present in the form of clouds, moisture in all season.
What are the major components of air?
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0%
Dust
0%
Water vapour
0%
Oxygen
0%
All of the above
Explanation
Air is a mixture of many gases. It has water vapour, oxygen, carbon dioxide, nitrogen, dust and smoke, among many other components.
Which one of the following is present in the largest amount in terms of percent by mass in the earth's crust?
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0%
Carbon
0%
Oxygen
0%
Silicon
0%
Calcium
Explanation
Oxygen is the most abundant element in the earth's crust. Again most of the earth's crust is composed of silica which is composed of 1 part of Silicon and 2 parts of oxygen. So mass percent of oxygen is highest in earth's crust.
The two major gaseous components of air are:
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0%
nitrogen and oxygen
0%
carbon dioxide and oxygen
0%
argon and water vapour
0%
argon and carbon dioxide
Explanation
Air is made up of 78.09% of nitrogen, 20.95% of oxygen, 0.93% of argon, 0.04% of carbon dioxide gas, and other gases in trace amounts. Thus nitrogen and oxygen are major gaseous components of air. Hence option A is correct.
Carbon exists in the atmosphere in the form of:
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0%
carbon monoxide only
0%
methane
0%
carbon dioxide
0%
coal
Explanation
In the atmosphere, carbon exists primarily in the form of carbon dioxide $$(CO_2)$$ and methane gas $$(CH_4)$$.
Oxygen and carbon dioxide are replaced in nature through
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0%
Photosynthesis
0%
Respiration
0%
Both A and B
0%
None of these
Explanation
In photosynthesis, plants make food using carbon dioxide and sunlight, and produce oxygen in the process which is released into the environment. This oxygen is taken in by animals during respiration and carbon dioxide is given out. Plants also consume oxygen for respiration. So, there is a balance of oxygen and carbon dioxide in nature.
The most abundant gas in the atmosphere is
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0%
Carbon dioxide
0%
Helium
0%
Nitrogen
0%
Oxygen
Explanation
Nitrogen is the most abundant gas in the atmosphere.
Nitrogen = 78 %,
Oxygen = 21 %,
Carbon dioxide = 0.04%
Helium = 0.0005%
By looking at the above values we can say that nitrogen is the most abundant gas in the atmosphere.
So, option C is correct.
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