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?

Only II

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Only III

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Only I

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Both I and III

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Solution

The correct option is A
Only II

Air is a mixture of gases, water vapour and dust particles. Nitrogen and oxygen are the major components of air. The other gases are carbon dioxide, water vapour, noble gases, etc. The composition of air is not fixed and varies slightly from place to place. Nitrogen occupies 78% of the air and Oxygen occupies 21% of the air, and hence nitrogen and oxygen are the major components of air.

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Similar questions

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?

Read the two statements given below:
(i) The compressed air in the tires of a car exerts a force enough to lift it.
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Q. Question 3
Which of the following statements are correct?
(i) Sound is produced by vibrations.
(ii) Sound requires a medium for propagation.
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(iv) Sound travels slower than light.

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(b) i and ii only
(c) i, ii and iii only
(d) ii, iii and iv only

Q. Which of the following statements about the G77 are untrue?

Statement (I): The G77 is a group of 134 member countries at present.
Statement (II): It was established on 18 July, 1954.
Statement (III): It is an organisation that comprises only developed countries.

What percentage of air contains nitrogen and oxygen gases only?

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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?

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?