Assertion : Perfectly ideal solution is not possible with respect to binary solution of two liquids.

Reason : No two substances can have exactly the same nature of intermolecular forces & also of the same magnitude.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Concept Questions :-

Introduction/ Colligative properties
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Assertion :  When a cell is placed in hypertonic solution, it shrinks.

Reason : Reverse osmosis is used for desalination of water.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Concept Questions :-

Osmosis and Osmotic Pressure
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Assertion : The difference in the boiling points of equimolar solution of HCI and HF decreases as their

                  molarity is decreased.

Reason : The extent of dissociation decreases steadily with increasing dilution.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Concept Questions :-

Van’t Hoff Factor
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Assertion : The molar mass obtained for benzoic acid in benzene is found to be nearly

Reason : Benzoic acid has the formula HOOC

                

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Concept Questions :-

Van’t Hoff Factor
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Assertion : When 'a' mL of a 0.1 molal urea solution is mixed with another 'b' mL of 0.1 molal glucose

                   solution, the boiling point of the solution is no different from the boiling points of the

                   samples prior to mixing but if 'a' mL of 0.1 molal urea is mixed with 'b' mL of 0.1 molal HF

                   the boiling point of the mixture is different from the boiling points of the separate

                   samples.

Reason : HF is an electrolyte (weak) whereas glucose is a non electrolyte.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Concept Questions :-

Van’t Hoff Factor
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The latent heat of vaporisation of water is 540 cal g-1at 100°C. Kb for water is

(A) 0.562 K.mole-1   

(B) 1.86 K.mole-1 

(C) 0.515 K.mole-1

 (D) 5.12 K.mole-1

 

Concept Questions :-

Elevation of Boiling Point
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The Van't Hoff factor for 0.1 M Ba(NO3)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
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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 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 molar freezing point constant for water is 1.86°C/mole. If 342 g of cane sugar (C12H22O11) 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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