(a) Cleaning action of soap and detergents is due to lowering of surface tension between water and greasy substances.
(b) The temperature at which vapour pressure of liquid becomes equal to the external pressure is known as boiling point of a liquid.
(c) Glycerol has higher viscosity because glycerol has more extent of hydrogen bonding than ethylene glycol.
(d) Surface tension of a liquid increases with increase in the magnitude of inter-molecular forces.
(e) Liquids are much less compressible than gases because the inter-molecular distances of separation are much smaller in liquids than in gases.
