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    States of Matter

    Multiple Choice QuestionsShort Answer Type

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    151.

    What do you mean by state of dynamic equilibrium?

    During the evaporation of a liquid in a closed vessel, a stage is reached when the rate of evaporation becomes equal to the rate of condensation. In such a state, the system is not at rest though there is no change in the system because the amount of liquid level in the vessel does not change. This does not mean that evaporation has stopped. In fact, the number of molecules which escape from the liquid to the vapour phase (due to evaporation) becomes equal to the number of molecules which return to the liquid from the vapour phase (due to condensation). This state is known as dynamic equilibrium. At dynamic equilibrium state, the two opposing processes (evaporation and condensation) occur at an equal rate.
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    152.

    Separate portions of chloroform and water at the same temperature are poured on your hands. The chloroform feels colder. Account for this in terms of attractive forces.

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    153.

    Why is cooling caused in evaporation?

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    154.

    Explain why alcohol produces a greater cooling effect on skin that water does.

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    155.

    Why does the temperature of the boiling liquid remain constant?

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    Multiple Choice QuestionsLong Answer Type

    156.

    Explain briefly the boiling point of a liquid. What is the effect of change in external pressure on the boiling point?

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    Multiple Choice QuestionsShort Answer Type

    157.

    Will water boil at a higher temperature at sea level or on the top of a mountain ?

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    158. How will you differentiate between evaporation and boiling?
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    159.

    What do you understand by vapour pressure of solids?

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    Multiple Choice QuestionsLong Answer Type

    160.

    Explain the term surface tension.

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