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States of Matter

Short Answer Type

61.

What are SI units of surface tension and coefficient of viscosity?

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62.
Viscosity of liquids decreases as the temperature rises. Why?

This is because, at high temperature, molecules have high kinetic energy and can overcome the intermolecular forces to slip fast one another between the layers.

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63.

What are intermolecular forces?

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64.

Name two solids which directly change into vapours on heating.

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65.

Does the volume of a solid change on slight heating?

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66. What are characteristic properties of gases?

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67.

How are the following properties of a gas measured:
(i) Mass (ii) Volume?

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68.

How pressure of a gas is determined experimentally?

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Long Answer Type

69.

What are the units of pressure?

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Short Answer Type

70.

A manometer is connected to a gas containing bulb. The open arm reads 43.7 cm where the arm connected to the bulb reads 15.6 cm. If the barometric pressure is 743 nm mercury what is the pressure of the gas in a bar?

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