Question
(a) Of NH3 and CO2 which will be adsorbed more readily on the surface of charcoal and why?
(b) How are multimolecular colloids different from macro-molecular colloids?
(c) State the principle of electro-dialysis.
Solution
Answer:
a) NH3 has higher critical temperature than CO2 i.e. NH3 has greater intermolecular forces of attraction hance will be adsorbed more readily.
b) In this type of colloids, colloidal particles are aggregates of atom or molecules each having size less than 1 nm e.g. sulphur sol. gold sol.
multimolecular colloids are generally lyophobic in nature.
In this type of colloids, colloidal particles are themselves large molecules of colloidal dimension e.g. strach protein.
c)The movement of colloidal particles towards oppositely charged electrode in an electric field is called electrophoresis.
a) NH3 has higher critical temperature than CO2 i.e. NH3 has greater intermolecular forces of attraction hance will be adsorbed more readily.
b) In this type of colloids, colloidal particles are aggregates of atom or molecules each having size less than 1 nm e.g. sulphur sol. gold sol.
multimolecular colloids are generally lyophobic in nature.
In this type of colloids, colloidal particles are themselves large molecules of colloidal dimension e.g. strach protein.
c)The movement of colloidal particles towards oppositely charged electrode in an electric field is called electrophoresis.
When electric potential is applied across two platinum electrodes dipping in a colloidal solution, the colloidal particles move towards one or the other electrode.
