The molal b.p. constant for water is $0{.513}^{o}C\text{\hspace{0.17em}}kg\text{\hspace{0.17em}}mo{l}^{-1}$. When 0.1 mole of sugar is dissolved in 200 g of water, the solution boils under a pressure of 1 atm at [AIIMS 1991]

(1) 100.513°C

(2) 100.0513°C

(3) 100.256°C

(4) 101.025°C

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An aqueous solution containing 1 g of urea boils at 100.25°C. The aqueous solution containing 3 g of glucose in the same volume will boil at [BHU 1994, CBSE 2000]

(1) 100.75°C

(2) 100.5°C

(3) 100°C

(4) 100.25°C

Concept Questions :-

Osmosis and Osmotic Pressure
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Solution of sucrose (Mol. Mass = 342) is prepared by dissolving 34.2 gm. of it in 1000 gm. of water. freezing point of the solution is (Kf for water is 1.86 K kg mol–1) [AIEEE 2003]

(1) 272.814 K

(2) 278.1 K

(3) 273.15 K

(4) 270 K

Concept Questions :-

Depression of Freezing Point
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An aqueous solution of a weak monobasic acid containing 0.1 g in 21.7 g of water freezes at 272.817K. If the value of Kf for water is 1.86 K kg mol–1, the molecular mass of the acid is [AMU 2002]

(1) 46.0

(2) 48.6

(3) 48.8

(4) 46.8

Concept Questions :-

Depression of Freezing Point
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What is the molality of solution of a certain solute in a solvent if there is a freezing point depression of 0.184° and if the freezing point constant is 18.4

(1) 0.01

(2) 1

(3) 0.001

(4) 100

Concept Questions :-

Depression of Freezing Point
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A solution containing 6.8 g of a nonionic solute in 100 g of water was found to freeze at $-0{.93}^{o}C$. The freezing point depression constant of water is 1.86. Calculate the molecular weight of the solute

[Pb. PMT 1994; ISM Dhanbad 1994]

(1) 13.6

(2) 34

(3) 68

(4) 136

Concept Questions :-

Depression of Freezing Point
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The molar freezing point constant for water is 1.86°C/mole. If 342 g of cane sugar $\left({\mathrm{C}}_{12}{\mathrm{H}}_{22}{\mathrm{O}}_{11}\right)$ is dissolved in 1000 g of water, the solution will freeze at

(1) –1.86°C

(2) 1.86°C

(3) –3.92°C

(4) 2.42°C

Concept Questions :-

Depression of Freezing Point
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Difficulty Level:

The molal freezing point constant for water is 1.86°C/m. Therefore, the freezing point of 0.1 m NaCl solution in water is expected to be [MLNR 1994]

(1) –1.86°C

(2) –0.186°C

(3) –0.372°C

(4) +0.372°C

Concept Questions :-

Depression of Freezing Point
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The depression in freezing point of 0.01 M aqueous solutions of urea, sodium chloride and sodium sulphate is in the ratio of [Roorkee 1990; DCE 1994]

(1) 1 : 1 : 1

(2) 1 : 2 : 3

(3) 1 : 2 : 4

(4) 2 : 2 : 3

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The Van't Hoff factor for 0.1 M $\mathrm{Ba}{\left({\mathrm{NO}}_{3}\right)}_{2}$ solution is 2.74. The degree of dissociation is [IIT 1999]

(1) 91.3%

(2) 87%

(3) 100%

(4) 74%

Concept Questions :-

Van’t Hoff Factor