Problem 41
Which one of the following is lyophilic colloid? (a) \(\mathrm{Pt}\) (b) Gum (c) Fog (d) Blood
Problem 42
Small liquid droplets dispersed in another liquid is called: (a) suspension (b) emulsion (c) gel (d) true solution
Problem 43
Which of the following is an example of associated colloid? (a) Protein in water (b) Soap in water (c) Rubber in benzene (d) \(\mathrm{FeCl}_{3}\) in \(\mathrm{H}_{2} \mathrm{O}\)
Problem 44
Select the properties which are for lyophilic colloidal sols: (a) viscosity same as that of the medium (b) extensive hydration takes place (c) particles migrate either towards cathode or anode in an electric field (d) particle cannot be detected even under ultramicroscope
Problem 45
Fog is an example of colloidal system of: (a) liquid in a gas (b) gas in a liquid (c) gas in a solid (d) solid in a liquid
Problem 46
Colloidal solutions are not classified on the basis of : (a) molecular size (b) nature of the particles (c) surface tension value (d) interaction between disperse phase and dispersion medium
Problem 51
Arsenous sulphide sol is prepared by passing \(\mathrm{H}_{2} \mathrm{~S}\) through arsenous oxide solution. The charge developed on the particies is due to adsorption of: (a) \(\mathrm{H}^{+}\) (b) \(\mathrm{S}^{2-}\) (c) \(\mathrm{OH}^{-}\) (d) \(\mathrm{O}^{2-}\)
Problem 52
Bredig's arc method cannot be used for the preparation of colloidal sol of : (a) copper (b) gold (c) silver (d) sodium
Problem 55
The minimum amount of an electrolyte required to cause coagulation of a sol is called: (a) Coagulation value (b) Gold number (c) Protective value (d) None of these
Problem 56
The electrical charge on a colloidal particle is indicated by: (a) Brownian movement (b) electrophoresis (c) ultramicroscope (d) molecular sieves
