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Test: Concentration of Solutions, Vapour pressure - JEE MCQ


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15 Questions MCQ Test - Test: Concentration of Solutions, Vapour pressure

Test: Concentration of Solutions, Vapour pressure for JEE 2024 is part of JEE preparation. The Test: Concentration of Solutions, Vapour pressure questions and answers have been prepared according to the JEE exam syllabus.The Test: Concentration of Solutions, Vapour pressure MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Concentration of Solutions, Vapour pressure below.
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Test: Concentration of Solutions, Vapour pressure - Question 1
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The molal elevation constant is the elevation in boiling point of

Detailed Solution for Test: Concentration of Solutions, Vapour pressure - Question 1

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: Concentration of Solutions, Vapour pressure - Question 2
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Which of the following modes of expressing concentration is independent of temperature?

Detailed Solution for Test: Concentration of Solutions, Vapour pressure - Question 2
The molality involves weights of the solute and the solvent. Since weight does not change with the temperature, therefore molality does not depend upon the temperature.
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Test: Concentration of Solutions, Vapour pressure - Question 3
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How many grams of concentrated nitric acid solution should be used to prepare of ? The concentrated acid is

Detailed Solution for Test: Concentration of Solutions, Vapour pressure - Question 3

Molarity


wt. of acid

Test: Concentration of Solutions, Vapour pressure - Question 4
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Which of the following statements, regarding the mole fraction of a component in solution, is correct?
Detailed Solution for Test: Concentration of Solutions, Vapour pressure - Question 4
Mole fraction has value ranging from 0 to 1 only.
Test: Concentration of Solutions, Vapour pressure - Question 5
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The vapour pressure of water at is 17.54 mm Hg. When 20 g of a non-ionic, substance is dissolved in 100 g of water, the vapour pressure is lowered by 0.30 mm Hg. What is the molecular mass of the substance?
Detailed Solution for Test: Concentration of Solutions, Vapour pressure - Question 5

or


Test: Concentration of Solutions, Vapour pressure - Question 6
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Two liquids X and Y form an ideal solution at , vapour pressure of the solution containing 1 mol of X and 3 mol of Y is . At the same temperature, if 1 mol of Y is further added to this solution, vapour pressure of the solution increases by . Vapour pressure (in mmHg) of X and Y in their pure states will be, respectively–
Detailed Solution for Test: Concentration of Solutions, Vapour pressure - Question 6
According to Dalton’s law of partial pressure


On solving
Test: Concentration of Solutions, Vapour pressure - Question 7
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Which of the following is not an ideal solution?
Detailed Solution for Test: Concentration of Solutions, Vapour pressure - Question 7
An ideal solution obey Raoult’s law at all temperature and pressures.
The solute-solute and solvent-solvent interactions are similar to solute-solvent interactions.
1. Benzene + Toluene Ideal solution
2. Chlorobenzene -dichlorobenzene Ideal solution
3. Methyl iodide + Isopropanol Non-ideal solution
4. Ethyl bromide + Methyl bromide Ideal solution
Hence, only methyl iodide and isopropanol is not an ideal solution.
Test: Concentration of Solutions, Vapour pressure - Question 8
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An azeotropic solution of two liquids has boiling point lower than either of them when it
Detailed Solution for Test: Concentration of Solutions, Vapour pressure - Question 8
In case of positive deviation from Raoult's law, the observed vapour pressure is greater than the ideal vapour pressure and boiling point of azeotrope becomes lower than either of pure liquid.
Test: Concentration of Solutions, Vapour pressure - Question 9
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Which among the following will show maximum osmotic pressure?
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Vant Hoff factor in case of ,
Test: Concentration of Solutions, Vapour pressure - Question 10
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Which of the following is not correct?
Detailed Solution for Test: Concentration of Solutions, Vapour pressure - Question 10
Ethanol has hydrogen bonding while acetone has dipole-dipole forces. Thus, their mixture would form a non-ideal solution.
Test: Concentration of Solutions, Vapour pressure - Question 11
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A solution of acetone in ethanol
Detailed Solution for Test: Concentration of Solutions, Vapour pressure - Question 11
A solution of acetone in ethanol shows positive deviation from Raoult's law. It is because ethanol molecules are strongly hydrogen bonded. When acetone is added, these molecules break the hydrogen bonds and ethanol becomes more volatile. Therefore its vapour pressure is increased.
Test: Concentration of Solutions, Vapour pressure - Question 12
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An aqueous solution is molal in KI. Which change will cause the vapour pressure of the solution to increase?
Detailed Solution for Test: Concentration of Solutions, Vapour pressure - Question 12
When the aqueous solution of one molal is diluted with water, concentration decreases, therefore the vapour pressure of the resulting solution increases.
Test: Concentration of Solutions, Vapour pressure - Question 13
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and are the vapour pressure of pure liquid components, and , respectively of an ideal binary solution. If represents the mole fraction of component , the total pressure of the solution will be.
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Test: Concentration of Solutions, Vapour pressure - Question 14
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Which condition is not satisfied by an ideal solution?
Detailed Solution for Test: Concentration of Solutions, Vapour pressure - Question 14

For an ideal solution,

Volume change of mixing should be zero.

Heat change on mixing should be zero.

Obey Raoult's law every range of concentration.

Test: Concentration of Solutions, Vapour pressure - Question 15
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Which of the following is true regarding azeotropes?
Detailed Solution for Test: Concentration of Solutions, Vapour pressure - Question 15
Azeotropes have the same concentration in the vapour phase and the liquid phase. In case of minimum boiling azeotropes, the boiling point of the azeotrope is lesser than the booling point of either of the pure components. In case of maximum boiling azeotropes, the boling point of the azeotrope is higher than the boiling point of either of the pure components.
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