Question

Which one of the following statements is FALSE for hydrophilic sols ?

(1) Their viscosity is of the order of that of H₂O.

(2) The sols cannot be easily coagulated.

(3) They do not require electrolytes for stability.

(4) These sols are reversible in nature.

Answer 1

Answer is Option 1 as viscosity of lyophillic sols is more then solvent.

Answer 2

(1) Their viscosity is of the order of that of H₂O.

→ Viscosity of hydrophilic sol > viscosity of H₂O

→ Hydrophilic sol is more stable so can't be
easily coagulated.

→ Hydrophilic sols are reversible sols.

→ No electrolytes are required to stabilise hydrophilic sol.