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Solutions · Question 18

NEET (UG) 2019MCQEasy📈 Topic in 38% papers+4−1
1

The mixture that forms maximum boiling azeotrope is :

  1. Ethanol + Water
  2. Acetone + Carbon disulphide
  3. Heptane + Octane
  4. Water + Nitric acid

Answer

(4) Water + Nitric acid

Solution

Maximum boiling azeotropes are formed by solutions showing large negative deviation from Raoult’s law.

Ethanol + water and acetone + carbon disulphide show positive deviation (minimum boiling azeotrope for ethanol + water); heptane + octane forms a nearly ideal solution.

As per NCERT, nitric acid and water is an example of a maximum boiling azeotrope: the mixture of about 68 % nitric acid and 32 % water by mass boils at 393.5 K.

Answer: (4)

NEET (UG) 2019

Keep practising — Solutions

2

If molality of the dilute solution is doubled, the value of molal depression constant (Kf) will be

  1. halved
  2. tripled
  3. unchanged
  4. doubled.
NEET 2017
3

Which of the following is dependent on temperature?

  1. Molarity
  2. Mole fraction
  3. Weight percentage
  4. Molality
NEET 2017
4

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 temperature is constant at 25 . (Given, vapour pressure data at 25 , benzene = 12.8 kPa, toluene = 3.85 kPa)

  1. The vapour will contain equal amounts of benzene and toluene.
  2. Not enough information is given to make a prediction.
  3. The vapour will contain a higher percentage of benzene.
  4. The vapour will contain a higher percentage of toluene
NEET 2016 (Phase 1)
5

At 100 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

  1. 102
  2. 103
  3. 101
  4. 100
NEET 2016 (Phase 1)
6

The van't Hoff factor (i) for a dilute aqueous solution of the strong electrolyte barium hydroxide is

  1. 0
  2. 1
  3. 2
  4. 3
NEET 2016 (Phase 2)
7

Which one of the following is incorrect for ideal solution?

  1. Hmix = 0
  2. Umix = 0
  3. P = Pobs - Pcalculated by Raoult's law = 0
  4. Gmix = 0
NEET 2016 (Phase 2)
8

What is the mole fraction of the solute in a 1.00 m aqueous solution?

  1. 1.770
  2. 0.0354
  3. 0.0177
  4. 0.177
AIPMT 2015
9

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 is true in this case?

  1. Molecular mass of X is less than the molecular mass of Y.
  2. Y is undergoing dissociation in water while X undergoes no change.
  3. X is undergoing dissociation in water.
  4. Molecular mass of X is greater than the molecular mass of Y.
AIPMT 2015 (Cancelled)
10

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)?

  1. Al(NO3)3
  2. K4[Fe(CN)6]
  3. K2SO4
  4. K3[Fe(CN)6]
AIPMT 2015 (Cancelled)
11

Which of them is not equal to zero for an ideal solution?

  1. Vmix
  2. P = Pobserved - PRaoult
  3. Hmix
  4. Smix
AIPMT 2015 (Cancelled)

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