Why vegetables are cooked with difficulty at a hill station?

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

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

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

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

What is the effect of temperature on: (i) surface tension (ii) viscosity.

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

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 ?

Insects can walk on the surface of water. Why?

Name two compounds which lower the surface tension of water.