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NEET (UG) 2020MCQEasy📈 Topic in 38% papers+4−1
Ques. 1NEET (UG) 2020

The mixture which shows positive deviation from Raoult's law is :

  1. Benzene + Toluene
  2. Acetone + Chloroform
  3. Chloroethane + Bromoethane
  4. Ethanol + Acetone

Answer

(4) Ethanol + Acetone

Solution

As per NCERT, in pure ethanol the molecules are hydrogen bonded. On adding acetone, its molecules get in between the ethanol molecules and break some of the hydrogen bonds.

The A–B interactions are therefore weaker than A–A and B–B interactions, so the escaping tendency of molecules increases and the mixture shows positive deviation from Raoult's law.

Benzene + toluene and chloroethane + bromoethane form nearly ideal solutions, while acetone + chloroform form hydrogen bonds with each other, which is why they show negative deviation.

Answer: (4)

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Ques. 2NEET (UG) 2019

For an ideal solution, the correct option is :

  1. mix H = 0 at constant T and P
  2. mix G = 0 at constant T and P
  3. mix S = 0 at constant T and P
  4. mix V 0 at constant T and P
Ques. 3NEET (UG) 2019

The mixture that forms maximum boiling azeotrope is :

  1. Ethanol + Water
  2. Acetone + Carbon disulphide
  3. Heptane + Octane
  4. Water + Nitric acid
Ques. 4NEET 2017

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.
Ques. 5NEET 2017

Which of the following is dependent on temperature?

  1. Molarity
  2. Mole fraction
  3. Weight percentage
  4. Molality
Ques. 6NEET 2016 (Phase 1)

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
Ques. 7NEET 2016 (Phase 1)

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
Ques. 8NEET 2016 (Phase 2)

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
Ques. 9NEET 2016 (Phase 2)

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
Ques. 10AIPMT 2015

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
Ques. 11AIPMT 2015 (Cancelled)

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.

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