1.

Explain the following :(i) Same substance can act both as colloids and crystalloids. (ii) Artificial rain is caused by spraying salt over clouds.

Answer»

(i) The nature of the substance whether colloid or crystalloid depends upon size of the solute particles. When the size of solute particles lies between 1 to 1000 nm, it behaves as a colloid. 

(ii) The colloidal water particles of the clouds get neutralized and coagulated to bigger water drops by spraying salt over clouds and as a result artificial rain is caused.



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