States of Matter

Short Answer Type

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Why can a glass be filled above its rim with water?

This is due to the existence of surface tension. The water piles up, trying to assume a spherical shape. However, if too much water is added to the glass, the force of gravity dominates over surface tension and the ‘skin’ breaks and water overflows.
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    What is the effect of temperature on: (i) surface tension (ii) viscosity.

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    What is the difference between a normal boiling point and standard boiling point ?

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    Arrange ether, water and ethyl alcohol in order of decreasing intermolecular attractive forces.

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    Why vegetables are cooked with difficulty at a hill station?

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    Name two compounds which lower the surface tension of water.

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    Insects can walk on the surface of water. Why?

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    The heat of vaporisation of water at 100°C is 40·6 kJ per mole and that of benzene at 80°C is 31kJ per mole. Which out of the two has stronger attractive forces ?

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    Vapour pressure of ether and alcohol is higher than water. Why?

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    Arrange water, benzene and acetone in order of increasing boiling point. 

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