Air as a Mixture

Q. Carbon dioxide is used to extinguish fire.

1. True
2. False

Q.

What is air? Name the major constituents of air?

Q. How are air bubbles formed?

Q. Which of the following statements are true?

1. Air is a mixture of gases, water vapour
2. Air is a pure gas
3. Air is composed of only nitrogen
4. Air is composed of only oxygen

Q. What happens if nitrogen is the supporter of burning and not oxygen ?

Q.

Is air a Good Insulator?

Q. ___ is a major plant macronutrient found in nucleic acids and proteins.

1. Calcium
2. Helium
3. Oxygen
4. Nitrogen

Q.

Write names and percentage of composition of gases present in air.

Q.

Choose the odd one out. Give reason for the same. [1 MARK]
rustling of leaves, flying of kite, making tea

Q.

John and Sam were soon joined by their common friend Kenneth. Kenneth got to know about the discussion John and Sam were having. He too wanted to share some of his knowledge about air and asked to join the conversation. Sam and John both welcomed him and started firing questions on him.

Sam: Kenneth, do you know about the composition of air?

Kenneth: Yes, I do! it is a mixture of gases, water vapour and dust particles.

Sam: Fine, can you tell us its composition?

Kenneth: Hmmm, I am not sure about that.

Sam: Okay, just tell us the major components of air.

So can you answer the last question that was asked to Kenneth?

1. Nitrogen

2. Water vapours

3. Nitrogen and Oxygen

4. Oxygen and carbon dioxide

Q.

carbon dioxide gas is used to extinguish fire

1. True
2. False

Q. Sam asked Kenneth 'Now that you know about the composition of air, can you tell us (Sam and John) why the composition of air varies from place to place?' Kenneth began to think as he had no answer for this question. But having developed a reasonable idea about air and its properties John was able to connect the dots and gave a quick and loud answer.

What was John's answer?

1. It is due to the smoke and gases emitted by the automobiles along with dust particles present in the air.

2. It is due to the fact that earth is spherical in shape.

3. It is due to the fact that we continuously consume air.

4. It is due to the oceans and rivers.

Q.

What is use of compressing the air to a high pressure?

Q. Find out the correct statement from the statements given below.

1. Air is composed of only oxygen

2. Air is composed of only nitrogen

3. Air is a mixture of gases, water vapour and dust particles.

4. Air is a pure gas.

Q.

Question 13.2

A list of words is given in a box. Use appropriate words to fill up the blanks in the following statements.

Air, oxygen, wind, water vapour, mixture, combination,
direction, road, bottles, cylinders.

Air is a ___ of some gases

Q. Explain the composition of air.

Q. Statement: The mountaineers carry oxygen cylinders with them while climbing high mountains.​
Reason: The availability of air decreases with increasing height from the surface of the Earth.

1. Both the statement and the reason are correct, and the reason is not the correct explanation for the statement.
2. Both the statement and the reason are incorrect.​
3. The statement is correct, but the reason is incorrect.​
4. Both the statement and the reason are correct, and the reason is the correct explanation for the statement.​

Q.

Match the components in column I with the percentage by volume in column II as per the composition of air.

1. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

2. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)

3. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)

4. (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)

Q. Which among the following is incorrect regarding the properties of air?

1. Air occupies space
2. Air does not have mass
3. Air can be easily compressed
4. Air is a mixture of gases

Q.

Explain different components of air in detail.

Q. The most abundant element on Earth by mass is _____.

1. O
2. C
3. H
4. N

Q. The two major gaseous components of air are:

1. nitrogen and oxygen
2. argon and carbon dioxide
3. carbon dioxide and oxygen
4. argon and water vapour

Q.

Question 1

What is the composition of air?

Q. Air is a gaseous mixture.

1. True
2. False

Q. The component which is not present in air is?

1. Nitrogen
2. Oxygen
3. Carbon dioxide
4. Chlorine

Q.

If we make a home made fire extinguisher we add baking powder as base and vinegar and acetic acid. In the real fire extinguisher are these things only there?

Q. Out of the given options, choose the option that correctly states the meaning of the given phrase/idiom:

1. to make completely understand
2. to excite great applause
3. to ruin oneself
4. None of these

Q.

Which of the following statements is true regarding the properties of air?

1. Air is a good conductor of electricity.

2. Air is a good conductor of heat.

3. Air is translucent in nature.

4. Air is a mixture.

Q.

How can you show that air contains water vapors? Is the water vapor constant in the air?

Q. Most abundant constituent of dry air in terms of volume is:

1. carbon dioxide
2. helium
3. nitrogen
4. oxygen