Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - NEET MCQ

# Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - NEET MCQ

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## 10 Questions MCQ Test Daily Test for NEET Preparation - Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19)

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Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - Question 1

### For an ideal solution with pA > pB, which of the following is true?

Detailed Solution for Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - Question 1

As A is more volatile, vapour phase would be richer in A. Hence
(xA)liquid < (xA)vapour

Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - Question 2

### Intermolecular forces between n-hexane and n-heptane are nearly same as between hexane and heptane individually. When these two are mixed, which of the following is not true about the solution formed?

Detailed Solution for Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - Question 2

Azeotropes are formed by the solutions which show deviations from ideal behaviour.

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Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - Question 3

### Study the figures given below and mark the correct statement.

Detailed Solution for Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - Question 3

Acetone + ethyl alcohol solution shows positive deviation while acetone + chloroform shows negative deviation.
Other examples:
Positive deviations - Acetone + ethyl alcohol,
acetone + benzene, water + ethyl alcohol
Negative deviations - Nitric acid + water,
benzene + chloroform

Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - Question 4

Given below are few mixtures formed by mixing two components. Which of the following binary mixtures will have same composition in liquid and vapour phase?
(i) Ethanol + Chloroform
(ii) Nitric acid + Water
(iii) Benzene + Toluene
(iv) Ethyl chloride + Ethyl bromide

Detailed Solution for Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - Question 4

(iii) and (iv) will form ideal solutions hence do not form azeotropes. Azeotropes have same composition in liquid and vapour form when distilled.

Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - Question 5

The molal elevation constant is the elevation in boiling point of

Detailed Solution for Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - Question 5

The correct answer is Option B.

Molal elevation constant is a characteristic constant for a given solvent. It is the elevation of boiling point produced when one mole of solute is dissolved in 1 kg of solvent. The proportionality constant, Kb, is called the molal boiling point elevation constant. It is a constant that is equal to the change in the boiling point for a 1-molal solution of a nonvolatile molecular solute.

Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - Question 6

What is the boiling point of a 3 molal aqueous solution if Kb is 0.512°C/m?

Detailed Solution for Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - Question 6

Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - Question 7

A solution was made by dissolving 2 g of a solute in 100 g of acetone. The solution boiled at 56.95° C. The boiling point of pure acetone is 55.95° C, and the Kb =1.71°C/m. What is the molecular weight of the solute?

Detailed Solution for Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - Question 7

The correct answer is Option B.

∆Tb =(Kb × 1000 × W2) / M2 × W1
⇒ M2 = (Kb × 1000 × W2) / ∆Tb × W1
= (1.71 × 1000 × 2) / 1 × 100
= 34.2g

Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - Question 8

Which of the two has lower freezing point, 2m NaCl or 5m NaCl aqueous solution?

Detailed Solution for Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - Question 8

The correct answer is option C
ΔTf= Kf  x m Since ΔTf for 5m NaCl will be higher than for 2m, 5m NaCl solution freezes at a lower temperature.

Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - Question 9

Which of the following unit of concentration is independent of temperature?

Detailed Solution for Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - Question 9

Molality (amount of moles per 1 kg of the solvent, mol/kg) and mole fraction (mol/mol) will remain constant since they are independent of volume of the solution which changes with temperature. Molarity i.e. amount of moles of a substance in 1 liter of a solution will change with volume of the solution so it will change with temperature.

Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - Question 10

Camphor is used as solvent to determine the molecular mass of non-volatile solute by Rast method because for camphor

Detailed Solution for Test: Ideal and Non Ideal Solutions and Colligative Properties (October 19) - Question 10

The correct answer is “molal depression constant is high”.

Camphor is used for the determination of molecular masses of solute by Rast method because its molal depression constant is very high 40Kmolality-1 .

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