Question:
Correct order of freezing point of $ 1\,M $ solution of sucrose, $ KCl,\,BaCl_{2}$ and $ AlCl_{3}$ is
Correct order of freezing point of $ 1\,M $ solution of sucrose, $ KCl,\,BaCl_{2}$ and $ AlCl_{3}$ is
Updated On: Jun 16, 2024
- Sucrose $ >KCl>BaCl_{2}>AlCl_{3} $
- $ AlCl_{3}>BaCl_{2}>KCl >$ Sucrose
- $BaCl_{2}>KCl>AlCl_{3}>$ Sucrose
- $ KCl>BaCl_{2}>AlCl_{3}>$ Sucrose
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The Correct Option is A
Solution and Explanation
Depression in freezing point is a colligative property, it means that as the number of particles (ions) of solute increases, freezing point of the solution decreases.
Sucrose $\longrightarrow$ not ionised
$KCl \rightleftharpoons \underbrace{ K ^{+}+ Cl ^{-}}_{2 \text{ions} }$
$BaCl _{2} \rightleftharpoons \underbrace{ Ba ^{2+}+2 Cl ^{-}}_{3 \text { ions }}$
$AlCl _{3} \rightleftharpoons \underbrace{ Al ^{3+}+3 Cl ^{-}}_{4 \text { ions }}$
Hence, the correct order of freezing point is
Sucrose $> KCl > BaCl _{2}> AlCl _{3}$
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Concepts Used:
Solutions
A solution is a homogeneous mixture of two or more components in which the particle size is smaller than 1 nm.
For example, salt and sugar is a good illustration of a solution. A solution can be categorized into several components.
Types of Solutions:
The solutions can be classified into three types:
- Solid Solutions - In these solutions, the solvent is in a Solid-state.
- Liquid Solutions- In these solutions, the solvent is in a Liquid state.
- Gaseous Solutions - In these solutions, the solvent is in a Gaseous state.
On the basis of the amount of solute dissolved in a solvent, solutions are divided into the following types:
- Unsaturated Solution- A solution in which more solute can be dissolved without raising the temperature of the solution is known as an unsaturated solution.
- Saturated Solution- A solution in which no solute can be dissolved after reaching a certain amount of temperature is known as an unsaturated saturated solution.
- Supersaturated Solution- A solution that contains more solute than the maximum amount at a certain temperature is known as a supersaturated solution.