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Elevation in Boiling Point MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET
Quick Facts
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Elevation in Boiling Point is considered one the most difficult concept.
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22 Questions around this concept.
Solve by difficulty
At 100°C the vapour pressure of a solution of 6.5g of a solute in 100g water is 732 mm. If Kb=0.52, the boiling point of this solution will be:
Assertion: The boiling point of a solution increases with increasing concentration of the solute.
Reasoning: The addition of a solute to a solvent increases the boiling point of the resulting solution due to the colligative property of boiling point elevation.
Assertion: A solution with a higher molality will always exhibit a larger boiling point elevation than a solution with a lower molality.
Reasoning: The boiling point elevation of a solution is directly proportional to the molality of the solution.
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A solution is prepared by dissolving a non-volatile solute in a solvent. Which of the following will result in a greater elevation in boiling point of the solution?
The rinse in boiling point of solution containing 1.4 g glucose in 100 g of solvent in . The molal elevation constant of liquid
A solution containing of non volatile solute What will be the
olecular mass of the solute if solute is in
of water boils at
{ Water boils at of water
}
Calculate the molar mass of substance when 5gYX is dissolved in
of
, it raised boiling point by
for
is
}
Concepts Covered - 1
Elevation in Boiling Point
Boiling Point: It is the temperature of a liquid at which its vapour pressure becomes equal to the atmospheric pressure. As vapour pressure of solution is lower than that of the solvents. As on addition of a non-volatile solute in a pure solvent's V.P decreases or V.P of solvent in pure state is more than that of solution. Now in order to boil the solution it is necessary to increase the temperature of solution above the B.P of pure solvent. It means B.P. of solution is always higher than B.P. of pure solvent. This increase in B.P. of solution is called elevation in B.P.(ΔTb).
- It is also termed as Ebullioscopy.
- It is measured by Lands Berger's method and Koltrell's method.
- Suppose Tob and Tb are the B.P. of pure solvent and solution respectively than elevation in B.P (ΔTb) is given as ΔTb = Tb - Tob
Here ΔTb is directly propotional to molality of solution
If molality of the solution is one, then
The elevation in B.P. is also given as
Molecular weight of solute can be find out as follows
Here w = weight of solute
W = weight of solvent
Kb = molal elevation constant or ebullioscopic constant.
M = molar mass of solute
Here Lv or ΔHv = latent heat of vapourization.
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