Statement 1- Air is a mixture.

Statement 2- Composition of air is fixed

Statement 1 is True and statement 2 is False

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Statement 1 is True and Statement 2 is True

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Statement 1 is False and statement 2 is False

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Statement 1 is False and statement 2 is True

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Solution

The correct option is A Statement 1 is True and statement 2 is False
Air is a mixture of different gases like nitrogen (78%), oxygen (21%), argon (1%), carbon-dioxide (0.03%) and water vapour. The composition of these gases are not fixed. For example, the proportion of carbon dioxide in cities is greater than that in rural areas. The amount of water vapour is greater in the rainy season than in the dry season.

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Similar questions

Q. 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.

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?

Few properties are mentioned below. Specify the property as mixture or compounds:

STATEMENT 1: The constituents can be separated easily by physical means.

STATEMENT 2: Has a variable composition.

STATEMENT 3: The composition is always fixed.

STATEMENT 4: Shows entirely different properties from constituent elements.

Q. Air is a mixture. Prove this statement.

Q. Which of the following is true about air?
(i) Air is a mixture of several gases.
(ii) Air exerts pressure.
(iii) The composition of air is constant at all places.

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Statement 1- Air is a mixture. Statement 2- Composition of air is fixed

Statement 1- Air is a mixture.

Statement 2- Composition of air is fixed