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Standard VI

Chemistry

Main Components

Which of thes...

Question

Which of these statements are true about air?
(i) Air is a mixture of several types of gases.
(ii) Air exerts pressure.
(iii) The composition of air is constant in the atmosphere.

(i) and (ii)

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(ii) and (iii)

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(i) and (iii)

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(i), (ii) and (iii)

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Solution

The correct option is A (i) and (ii)
Air is mixture of several gases like nitrogen, oxygen and carbon dioxide.
As air is like gas it exerts pressure.
The composition of air varies in the atmosphere.

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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.

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Which of these statements are true about air?(i) Air is a mixture of several types of gases.(ii) Air exerts pressure.(iii) The composition of air is constant in the atmosphere.

The correct option is A (i) and (ii)Air is mixture of several gases like nitrogen, oxygen and carbon dioxide.As air is like gas it exerts pressure.The composition of air varies in the atmosphere.

Which of these statements are true about air?
(i) Air is a mixture of several types of gases.
(ii) Air exerts pressure.
(iii) The composition of air is constant in the atmosphere.

The correct option is A (i) and (ii)
Air is mixture of several gases like nitrogen, oxygen and carbon dioxide.
As air is like gas it exerts pressure.
The composition of air varies in the atmosphere.