Test: Van't Hoff Factor (Liquid Solution) - JEE MCQ

An aqueous solution of a solute AB has boiling point of 101.08° C and freezes at -1 .80 °C . AB is found to be 100% ionised at boiling point. If K_b /K_f = 0.3, then AB

Osmolarity of 0.02 M potassium ferrocyanide solution at 300 K is (assume solute is 100% ionised)

AB and CD are two non -volatile solutes dissolved in same solvent, showing following behaviour

AB is ionised in solvent, α = degree of ionisation

CD is dimerised in solvent, 3 = degree of dimerisation

If α = 0.80, then β is

Which has the highest boiling point? 

One or More than One Options Correct Type
This section contains 3 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

Q.

Following solutions have been provided at temperature T K.
I. 1M aqueous glucose solution.
II. 1M aqueous sodium chloride solution.
III. 1M aqueous ammonium phosphate solution.
IV. 1M benzoic acid in benzene.
Select correct statements for the above solutions.

Which of the following statements are correct?

Matching List Type
Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct

Q.

Match the different solutions in Column I with their ΔT_b in Column II and select the answer from the codes given below.

In a 0.2 molal aqueous solution of a weak acid (HX), depression in freezing point is 0.383° K_f is 1.86° mol^-1 kg. Assum e molarity equal to molality.
Match the parameters in Column I with their values in Column II and select the answer from the codes given below.

Comprehension Type
This section contains a passage describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer out of the given 4 options (a), (b), (c) and (d)

Passage I

Hgl₂ is insoluble in water. This solute is added into Kl solution.

Q.

In the above case,

Hgl₂ is insoluble in water. This solute is added into Kl solution.

Q.

Passage I van’t Hoff factor in this example

Passage II

A solution containing 10 g of a dibasic acid in 1000 g of water freezes at -0.15° C. 10 mL of the acid is neutralised by 12 mL of 0.1 N NaOH solution. [K_f (H₂0 ) = 1.86° mol^-1 kg]

Q.

van’t Hoff factor (/') of the dibasic acid is

A solution containing 10 g of a dibasic acid in 1000 g of water freezes at -0.15° C. 10 mL of the acid is neutralised by 12 mL of 0.1 N NaOH solution. [K_f (H₂0 ) = 1.86° mol^-1 kg]

Q.

pH of the solution of the acid is

Passage III

A solution containing 0.684 g of cane sugar (C₁₂H₂₂0₁₁) in 100 g water freezes at - 0.037° C. A solution containing 0.585 g of NaCI in 100 g water freezes at - 0.342° C.

Q.

Apparent molecular weight of NaCI is 

Passage III

A solution containing 0.684 g of cane sugar (C₁₂H₂₂0₁₁) in 100 g water freezes at - 0.037° C. A solution containing 0.585 g of NaCI in 100 g water freezes at - 0.342° C.

Q.

van’t Hoff factor (i) is

Direction:

This section contains 5 questions. When worked out will result in an integer from 0 to 9 {both inclusive).

Q.

Relative decrease in vapour pressure of an aqueous NaCI solution is 0.167. Thus, number of moles of NaCI present in 180 g of H₂0 is ... .

Aqueous solution of barium phosphate which is 100% ionised has ΔT_f / K_f as 0.40. Hence, given solution is x * 10^-2 molal. What is the value of x?

0.002 molal aqueous solution of an ionic compound [Co(NH₃)₅(N0₂)]CI freezes at - 0.00732° C. [K_f (H₂0) = 1.86° mol^-1kg]. How many moles of ions does 1.0 mole of the salt produce on being dissolved in water?