Which one of the following elctrolytes has the same value of van't Hoff's factor(i) as that of Al2(SO4)3 (if all are 100% ionised)?
Of the following 0.10 m aqueous solutions, which one will exhibit the largest freezing point depression?
At 25° C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm1cm2mol-1 and at infinite dilution its molar conductance is 238 ohm1cm2mol-1. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is
pA and pB, are the vapour pressure of pure liquid components, A and B, respectively of an ideal binary solution.If x, represents the mole fraction of component A, the total pressure of the solution will be.
(a) pA + xA(pB-pA)
(b) pA + xA(pA-pB)
(c) pB + xA(pB-pA)
(d) pB + xA(pA-pB)
Concept Questions :-
The freezing point depression constant format is -1.86°C m-1. If 5.00g Na2SO4 dissolved in 45.0 g H2O, the freezing point is changed by -3.82°C. Calculate the van't Hoff factor for NaSO4
The van't Hoff factor, i for a compound which undergoes dissociation in one solvent and association in other solvent is respectively.
(a) less than one and less than one
(b) greater than one and less than one
(c) greater than one and greater than one
(d) less than one and greater than one
An aqueous solution is 1.00 molal in KI. Which change will cause the vapour pressure of the solution to increase ?
(a) Addition of NaCl
(b) Addition of Na2SO4
(c) Addition of 1.00 molal KI
(d) Addition of water
Concept Questions :-
A solution of sucrose (molar mass = 342 g mol-1) has been prepared by dissolving 68.5 g of sucrose in 1000 g of water. The freezing point of the solution obtained will be (kf for water = 1.86 K kg mol-1)
An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to
(a) increase in ionic mobility of ions
(b) 100% ionisation of electrolyte at normal dilution
(c) increase in both, i.e. number of ions and ionic mobility of ions
(d) increase in number of ions
The equivalent conductance of M/32 solution of a weak monobasic acid is 8.0 mho cm2 and at infinite dilution is 400 mho cm2 .The dissociation constant of this acid is.