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

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Solution

The answer is (b).
Oxygen makes up about 21% of air by volume. It is essential for the survival of human beings.

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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

The answer is (b). Oxygen makes up about 21% of air by volume. It is essential for the survival of human beings.

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

The answer is (b).
Oxygen makes up about 21% of air by volume. It is essential for the survival of human beings.