Air is a mixture of various gases. One of the gases is 21% part of the air and is essential for the survival of human beings. This gas is:

Nitrogen

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Oxygen

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Ozone

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Argon

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Solution

The correct option is C Oxygen
Oxygen present in air is 21% of the air and is essential for the survival of human beings.
Hence the correct option is B.

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Similar questions

Question 1
Air is a mixture of various gases. One of the gases constitutes 21% part of the air and is essential for the survival of human beings. This gas is:
(a) Nitrogen
(b) Oxygen
(c) Ozone
(d) Argon

Question 1
Air is a mixture of various gases. One of the gases constitutes 21% part of the air and is essential for the survival of human beings. This gas is:
(a) Nitrogen
(b) Oxygen
(c) Ozone
(d) Argon

Q. Air is said to be a mixture because air at different places contains different amounts of various gases.

Q. (a) Which gas is vital for the survival of all living organisms?

(b) Based on the above answer, explain how humans exchange gases?

(c) Name the process of burning of a substance in the presence of air.

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.

Which of the above statement is incorrect?

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Air is a mixture of various gases. One of the gases is 21% part of the air and is essential for the survival of human beings. This gas is:

The correct option is C OxygenOxygen present in air is 21% of the air and is essential for the survival of human beings.Hence the correct option is B.

The correct option is C Oxygen
Oxygen present in air is 21% of the air and is essential for the survival of human beings.
Hence the correct option is B.