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CBSE 11th Standard Chemistry Subject State of Matter Ncert Exemplar 1 Mark Questions 2021

Published on: 27/05/2021

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Questions:

1 Marks

5 x 1 = 5

One of the assumptions of kinetic theory of gases is that there is no forces of attraction between the molecules of a gas. State and explain the evidence that shows that the assumption is not applicable for real gas.

The behavior of matter in different states is governed by various physical laws.According to you, what are the factor that determines the state of matter?

One of the assumptions of kinetic theory of gases states that "there is no force of attraction between the molecules of a gas "How far is this statement correct?Is it possible to liquefy an ideal gas? Explain.

The magnitude of surface tension of liquid depends on the attractive forces between the molecules. Arrange the following in increasing order of surface tension water, alcohol (C₂H₅OH) and hexane [CH₃(CH₂)₄CH₃].

Name two intermolecular force that exists between HF molecules in a liquid state.

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Answers Key:

1 Marks

5 x 1 = 5

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Real gases can be liquefied by cooling and compression of the gas.This power that forces of attraction exist among the molecules.

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temperature, pressure, mass, and volume are the factors which determine the different states of matter. i.e. solid, liquid and gas.

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This statement is correct only for ideal gases.It is not possible to liquefy an ideal gas because there is no intermolecular forces of attraction between the molecules of an ideal gas.

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In hexane, there are only London forces between the molecules. The forces are very weak. H-bonding is stronger in H₂O in comparison to C₂H₅ OH. Hence, the increasing order of surface tension is hexane < alcohol < water.
Greater is the attractive forces between the molecules, greater is the magnitude of surface tension of liquid.