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

Q. 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:

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.

Fractional distillation is the separation of a mixture into its component or fractions. This process is based on difference in boiling point of the components in the mixture. This is a special type of distillation.

Air is a homogeneous mixture of 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases such as helium, krypton, nitrogen dioxide etc.

Consider three gases oxygen, nitrogen and argon whose boiling points are: -183, -196, -186 degree celsius. They are to be separated from air using fractional distillation.

Air is compressed by increasing pressure and is then cooled by decreasing the temperature to form liquid air. This liquid air is allowed to warm-up slowly in a fractional distillation column, where gases get separated at different heights depending upon their boiling points. As the height of tower increases the temperature increases.

Among the three gases, which gas is collected at last?

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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.