A 2.0% solution by weight of urea in water shows a boiling point elevation 0.18 deg [Molecular weight of urea=60].

Calculate the latent heat of vaporization per gram for water.

(a) 495.3 cal/g

(b) 560.3 cal/g

(c) 525.8 cal/g

(d) 501.3 cal/g

Concept Questions :-

Elevation of Boiling Point
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A solution of 18 g of glucose in 1000 g of water is cooled to -0.2°C. The amount of ice separating out from this solution is (KfH2O=1.86 K molal-1)

(a) 70 g

(b) 140 g

(c) 90 g

(d) 210 g

Concept Questions :-

Depression of Freezing Point
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The partial pressure of ethane over a saturated solution containing 6.56 X 10-2 g of ethane is 1 bar. If the solution contains 5.00 X 10-2 g of ethane, then what shall be the partial pressure of the gas.

(a) 0.76 bar

(b) 0.16 bar

(c) 1.16 bar

(d) 3.12 bar

Concept Questions :-

Dalton’s Law of Partial Pressure/ Henry"s law
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In a dilute solution, any colligative property depends on 

(a) The total number of neutral species in the solution

(b) The total number of ionic species in the solution

(c) The total number of species irrespective of whether they are ionic or non-ionic.

(d) The types of forces operating between the non-ionic species, ionic species and the solvent molecules

 

Concept Questions :-

Introduction/ Colligative properties
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An aqueous solution of 2 percent no volatile solute exerts a pressure of 1.004 bar at the boiling point of the solvent. What is the molecular mass of the solute ?

(a) 9.19 g mol-1

(b) 91.9 g mol-1

(C) 71.2 g mol-1

(d) 50.4 g mol-1

Concept Questions :-

Concentration Term and Numericals
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An aqueous solution of hydrochloric acid -

(a) obeys Raoult's law

(b) Shows negative deviations from Raoult's law

(c) Shows positive deviations from Raoult's law

(d) Obeys Henry's law at all compositions

Concept Questions :-

Introduction/ Colligative properties
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1000 gm of 1 m sucrose solution in water is cooled to -3.534°C. What weight of ice would be separated out at this temperature ? Kf'(H2O)=1.86 K mol-1kg.

(a) 352.98 gm.

(b) 252.98 gm.

(c) 302.98 gm.

(d) 152.12 gm

Concept Questions :-

Depression of Freezing Point
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Osmotic pressure of equimolar solution of BaCl2, NaCl and glucose will be in the order -

(a) BaCl> NaCl > glucose

(B) glucose > NaCI > BaCl2

(C) NaCl > BaCl2 >glucose

(D) NaCl> glucose > BaCl2

Concept Questions :-

Osmosis and Osmotic Pressure
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Nalorphene (C19H21NO3), similar to morphine, is used to combat withdrawal symptoms in narcotic users. Dose to nalorphene generally given is 1.5 mg. Calculate the mass of 1.5 X 10-3 m aqueous solution required for the above dose.

(a) 3.2 g

(b) 0.2 g

(c) 5.1 g

(d) 7.3 g

Concept Questions :-

Concentration Term and Numericals
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Which solution will have the highest boiling point ?

(a) 1 (M) C6H12O6 solution

(b) 1 (M) NaCl solution

(c) 1 (M) BaCl2 solution

(d) 1 (M) CO(NH2)2 solution

Concept Questions :-

Van’t Hoff Factor
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