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JEE Main 2024 (Online) 30th January Morning ShiftMCQEasy📈 Topic in 14% papers+4−1
Ques. 1JEE Main 2024, 30 January (Morning Shift)

What happens to freezing point of benzene when small quantity of naphthalene is added to benzene?

  1. Increases
  2. Decreases
  3. Remains unchanged
  4. First decreases and then increases

Answer

(2) Decreases

Solution

Tf = Kf m

∵ naphthalene is a non-volatile solute ⇒ vapour pressure of benzene is lowered ⇒ solid and liquid benzene are in equilibrium at a lower temperature

∴ Tf (solution) = Tf - Tf ⇒ freezing point decreases

Answer: (2)

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Ques. 2JEE Main 2024, 30 January (Evening Shift)

The solution from the following with highest depression in freezing point/lowest freezing point is

  1. 180 g of acetic acid dissolved in benzene
  2. 180 g of acetic acid dissolved in water
  3. 180 g of benzoic acid dissolved in benzene
  4. 180 g of glucose dissolved in water
Ques. 3JEE Main 2024, 30 January (Evening Shift)

If a substance 'A' dissolves in solution of a mixture of 'B' and 'C' with their respective number of moles as nA, nB and nC. Mole fraction of C in the solution is

  1. nCnA nB nC
  2. nBnA+nB
  3. nCnA+nB+nC
  4. nCnA-nB-nC
Ques. 4JEE Main 2024, 29 January (Morning Shift)

The osmotic pressure of a dilute solution is 7 105 Pa at 273 K. Osmotic pressure of the same solution at 283 K is 104 Nm-2.

Ques. 5JEE Main 2024, 29 January (Evening Shift)

Molality of 0.8 M H2SO4 solution (density 1.06 g cm-3) is 10-3 m.

Ques. 6JEE Main 2024, 27 January (Morning Shift)

A solution of two miscible liquids showing negative deviation from Raoult's law will have :

  1. increased vapour pressure, increased boiling point
  2. increased vapour pressure, decreased boiling point
  3. decreased vapour pressure, decreased boiling point
  4. decreased vapour pressure, increased boiling point
Ques. 7JEE Main 2024, 27 January (Evening Shift)

The quantity which changes with temperature is :

  1. Molality
  2. Molarity
  3. Mole fraction
  4. Mass percentage

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