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JEE Main 202122 JulyMorning Shift

Exam: JEE Main
Year: 2021
Date: 22 July
Shift: Morning Shift
Subject: Chemistry
Chapter: Solutions

JEE Main 2021 · 22 July · Morning Shift · Chemistry · Solutions

Which one of the following 0 . 06M aqueous solutions has lowest...

Which one of the following

0 . 06M

aqueous solutions has lowest freezing point ?

Options

A{Al}_{2}{ $\left({SO}_{4}\right)}_{3}$
B ${C}_{6}{H}_{12}{O}_{6}$
C $KI$
D ${K}_{2}{SO}_{4}$

Correct answer

A. {Al}_{2}{ $\left({SO}_{4}\right)}_{3}$

Step-by-step solution

${T}_{f}^{∘} - {T}_{f} = {iK}_{f} \cdot m$

${T}_{f}$ = Freezing point of the solution.

$i =$ Van 't Hoff factor

${K}_{f}$ = molal freezing point depression constant

$m =$ molality
For minimum ${T}_{f}$ , $i$ should have the maximum value.

$\begin{cases}{Al}_{2}{\left({SO}_{4}\right)}_{3} & i = 5 \\ {C}_{6}{H}_{12}{O}_{6} & i = 1 \\ KI & i = 2 \\ {K}_{2}{SO}_{4} & i = 3\end{cases}$

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