The Brownian movement of colloidal particles is because of –
1. Convection currents in the fluid
2. Unequal bombardments by the molecules of the dispersion medium on colloidal particles
3. Setting of dispersed phase under gravity
4. Thermal gradient in the medium
When solution is added to a negatively charged sol is obtained. It is due to the
(1) Presence of basic group
(2) Preferential adsorption of ions
(3) Self dissociation
(4) Electron capture by sol particles
Graph between log and log P is a straight line inclined at an angle - 45°. When pressure of 0.5 atm and log k = 0.699, the amount of solute adsorbed per g of adsorbent will be
(1) 1 g/g adsorbent
(2) 1.5 g/g adsorbent
(3) 2.5 g/g adsorbent
(4) 0.25 g/g adsorbent
The stabilization of the dispersed phase in a lyophobic sol is due to
(1) The viscosity of the medium
(2) The surface tension of the medium
(3) Liking for the medium
(4) The formation of an electrical layer between the two phases
Which of the following reactions leads to the formation of a substance in colloidal state?
(A)
(B)
(C)
(D)
of can be coagulated by -
1. 1 mol of Pb(NO3)2
2. \(\frac{1}{2}\) mol of Pb(NO3)2
3. \(\frac{2}{3}\) mol of Pb(NO3)2
4. None of the above.
The process of converting precipitate into collidal solution on adding an electrolyte is called:
(1) Peptisation
(2) Dialysis
(3) Electro-osmosis
(4) Eelectrophoresis
Assertion: Physical and chemical adsorption respond differently to a rise in temperature.
Reason: Chemical adsorption requires some activation energy.
Assertion : Catalyst in general, in the form of finely divided powder.
Reason : Finer is the particle of a solid, greater is its surface area.
Assertion : The addition of ferric hydroxide sol to arsenic sulphide sol results in the precipitation
of both.
Reson : The colloidal particles in ferric hydroxide carry positive charge, whereas those in arsenic
sulphide sol carry negative charge.