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Practice each question, then open the answer or worked solution.
Which of the following option are correct?
(i) Micelle formation by soap in aqueous solution is possible at all
temperatures.
(ii) Micelle formation by soap in aqueous solution occurs above a particular
concentration.
(iii) On dilution of soap, solution micelles may revert to individual ions.
(iv) Soap solution behaves like a normal strong electrolyte at all
concentrations.
Option (ii) and (iii) is the answer.
Which of the following statements are correct about solid catalyst?
(i) Same reactants may give different product by using different catalysts.
(ii) Catalyst does not change ∆H of reaction.
(iii) Catalyst is required in large quantities to catalyse reactions.
(iv) The catalytic activity of a solid catalyst does not depend upon the strength
of chemisorption.
Option (i) and (ii) is the answer.
Freundlich adsorption isotherm is given by the expression x/m = kp1/n which of the following conclusions can be drawn from this expression
(i) When1/n= 0, the adsorption is independent of pressure.
(ii) When 1/n = 0, the adsorption is directly proportional to pressure.
(iii)When n = 0,x/m vs p graph is a line parallel to x-axis.
(iv) When n = 0, a plot of x/m vs p is a curve.
Option (i) and (iii) are the answers.
H2 gas is adsorbed on activated charcoal to a very little extent in comparison
to easily liquefiable gases due to ____________.
(i) very strong van der Waal’s interaction.
(ii) very weak van der Waals forces.
(iii) very low critical temperature.
(iv) very high critical temperature.
Option (ii) and (iii) are the answers.
Which of the following statements are correct?
(i) Mixing two oppositely charged sols neutralises their charges and stabilises
the colloid.
(ii) Presence of equal and similar charges on colloidal particles provides
stability to the colloids.
(iii) Any amount of dispersed liquid can be added to emulsion without
destabilising it.
(iv) Brownian movement stabilises sols.
Option (ii) and (iv) are the answers.
An emulsion cannot be broken by __________ and ___________.
(i) heating
(ii) adding more amount of dispersion medium
(iii) freezing
(iv) adding emulsifying agent
Option (ii) and (iv) are the answers.
Which of the following substances will precipitate the negatively charged
emulsions?
(i) KCl
(ii) glucose
(iii) urea
(iv) NaCl
Option (i) and (iv) are the answers.
Which of the following colloids cannot be coagulated easily?
(i) Lyophobic colloids.
(ii) Irreversible colloids.
(iii) Reversible colloids.
(iv) Lyophilic colloids.
Option (iii) and (iv) are the answers.
What happens when a lyophilic sol is added to a lyophobic sol?
(i) Lyophobic sol is protected.
(ii) Lyophilic sol is protected.
(iii) Film of lyophilic sol is formed over lyophobic sol.
(iv) Film of lyophobic sol is formed over lyophilic sol.
Option (i) and (iii) are the answers.
Which phenomenon occurs when an electric field is applied to a colloidal
solution and electrophoresis is prevented?
(i) Reverse osmosis takes place.
(ii) Electroosmosis takes place.
(iii) Dispersion medium begins to move.
(iv) Dispersion medium becomes stationary.
Option (ii) and (iii) are the answers.