Explain the following:
(a) Same substance can act both as colloids and crystalloids.
(b) Artificial rain is caused by spraying salt over clouds.
(a) Sodium chloride behaves as a crystalloid when dissolved in water
but behaves as a colloid when dissolved in benzene.
(b) Artificial rain is caused by spraying common salt over the clouds,
as it is an electrolyte and brings about coagulation of water particles.