NEET Chemistry Surface Chemistry Questions Solved

BOARD

How are the following colloidal solutions prepared?

(a) Sulphur in water         (b) Gold in water

(a) Sulphur in water: An alcoholic solution (true solution) of sulphur in excess

of water is added then colloidal solution is obtained. Or, Oxidation of H2S

HNO3+H2SH2O+NO2+S

(b) Gold in water: Gold solution can be prepared by reduction of AuCl3 

solution with formaldehyde.

2AuCl3+3HCHO+3H2O2Au+3HCOOH+6HCl

                                      Gold Sol.

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