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?

Nitrogen

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Nitrogen and Oxygen

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Oxygen and carbon dioxide

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Water vapours

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Solution

The correct option is B
Nitrogen and Oxygen

Air is a mixture of gases, water vapour and dust particles. It has many gases such as nitrogen, oxygen, carbon dioxide, carbon monoxide, water vapour and even dust particles. The major components of air are nitrogen and oxygen. Nitrogen and oxygen occupy 78% and 21% of air respectively. Nitrogen does not supports combustion while oxygen supports the process of combustion.

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Similar questions

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?

Sam was impressed by John's quick answer and asked him another question somewhat related to the previous question itself.

Sam: John, now that you know so much about air around us, can you tell us which components of air is harmful for living beings?

John: I am not exactly sure about this, Kenneth, please help me answer this.

Kenneth: Oh yes, I can surely help you answer this question.

What was Kenneth's answer?

After Kenneth's reply, John came out confident and asked both of them (Sam and Kenneth)

John: Do you guys know about the most abundant gas in air?

Sam: Yes, I do!

Kenneth: Yes I do!

John: then tell me what the use of nitrogen is?

Sam: Nitrogen is used in protein synthesis.
Kenneth: Nitrogen is used in amino-acids that are used to manufacture proteins by living organisms.

Considering the two answers given by Sam and Kenneth, which one do you think is correct?

Kenneth explained about the most important component of air to John and Sam. John was satisfied with the answer but Sam wanted to add some more information to it. Sam further elaborated the properties of the most important component of air. He said, it is not only used by living organisms during respiration but it also supports_____________.

John wanted to know about the composition of air. He asked Sam to explain it to him whether air is composed of a single component or more than one component. To reply this query Sam made the following statements:

Statement I: Air is a mixture of gases, water vapour and dust particles.

Statement II: Air is composed of only one gas that is nitrogen.

Statement III: Air is composed of two gases, nitrogen and oxygen only.

Statement IV: Air is made up of more than one components.

Which of the above statement(s) are correct?

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