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Previous Years Questions

MCQ (Single Correct Answer)

Which amongst the following aqueous solution of electrolytes will have minimum elevation in boiling point? Choose the correct option :-
KH value for some gases at the same temperature 'T' are given : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-st...
The following solutions were prepared by dissolving 10 g of glucose (C6H12O6) in 250 ml of water (P1), 10 g of urea (CH4N2O) in 250 ml of water (P2) a...
The correct option for the value of vapour pressure of a solution at 45$$^\circ$$C with benzene to octane in molar ratio 3 : 2 is :[At 45$$^\circ$$C v...
The freezing point depression constant (Kr) of benzene is 5. 12 K kg mol-1. The freezing point depression for the solution of molality 0.078 m contain...
The mixture which shows positive deviation from Raoult's law is :
For an ideal solution, the correct option is :
The mixture that forms maximum boiling azeotrope is :
If molality of the dilute solution is doubled, the value of molal depression constant (Kf) will be
Which one of the following is incorrect for ideal solution?
The van't Hoff factor (i) for a dilute aqueous solution of the strong electrolyte barium hydroxide is
At 100oC the vapour pressure of a solution of 6.5 g of a solute in 100 g water is 732 mm. If Kb = 0.52, the boiling point of this solution will be ...
Which of the following statements about the composition of the vapour over an ideal 1 : 1 molar mixture of benzene and toluene is correct? Assume that...
The boiling point of 0.2 mol kg$$-$$1 solution of X in water is greater than equimolal solution of Y in water. Which one of the following statements ...
Which of them is not equal to zero for an ideal solution?
Which one of the following electrolytes has the same value of van't Hoff 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?
Which condition is not satisfied by an ideal solution?
Vapour pressure of chloroform (CHCl3) and dichloromethane (CH2Cl2) at 25oC are 200 mm Hg and 41.5 mm Hg respectively. Vapour pressure of the solution ...
pA and pB are the vapour pressure of pure liquid components, A and B, respectively of an ideal binary solution. If xA represents the mole fraction of ...
A 0.1 molal aqueous solution of a weak acid is 30% ionized. If Kf for water is 1.86oC/m, the freezing point of the solution will be ...
200 mL of an aqueous solution of a protein contains its 1.26 g. The osmotic pressure of this solution at 300 K is found to be 2.57 $$ \times $$ 10$$-$...
The freezing point depression constant for water is $$-$$1.86o C m$$-$$1. If 5.00 g Na2SO4 is dissolved in 45.0 g H2O, the freezing point is changed b...
The van't Hoff factor $$i$$ for a compound which undergoes dissociation in one solvent and association in other solvent is respectively
A solution of sucrose (molar mass = 342 g mol$$-$$) has been prepared by dissolving 68.5 g of sucrose in 1000 g of water. The freezing point of the so...
An aqueous solution is 1.00 molal in KI. Which change will cause the vapour pressure of the solution to increase?
A 0.0020 m aqueous solution of an ionic compound [Co(NH3)5(NO2)]Cl freezes at $$-$$ 0.00732oC. Number of moles of ions which 1 mol of ionic compound ...
0.5 molal aqueous solution of a weak acid (HX) is 20% ionised. If Kf for water is 1.86 K kg mol$$-$$1, the lowering in freezing point of the solution ...
During osmosis, flow of water through a semipermeable membrane is
A solution of acetone in ethanol
1.00 g of a non-electrolyte solute (molar mass 250 g mol$$-$$1) was dissolved in 51.2 g of benzene. If the freezing point depression constant, Kf of b...
A solution containing 10 g per dm3 of urea (molecular mass = 60 g mol$$-$$1) is isotonic with a 5% solution of a nonvolatile solute is ...
The vapour pressure of two liquids P and Q are 80 and 60 torr, respectively. The total vapour pressure of solution obtained by mixing 3 mole of P and ...
A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressures of the pure hydrocarbons at 20oC are 440 mm Hg for pentane and 120 mm Hg ...
A solution of urea (mol. mass 56 g mol$$-$$1) boils at 100.18oC at the atmospheric pressure. If Kf and Kb for water are 1.86 and 0.512 K kg mol$$-$$1 ...
A solution containing components A and B folloes Raoult's law
A solution contains non volatile solute of molecular mass M2. Which of the following can be used to calculate the molecular mass of solute in terms of...
Pure water can be obtained from sea water by
From the colligative properties of solution, which one is the best method for the determination of molecular weight of proteins and polymers?
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