Q1 / 90 · JEE Main 2018 (08 Apr) · Chemistry

For $1 molal$ aqueous solution of the following compounds, which one will show the highest freezing point?

Correct answer
A
$[Co {(H_{2} O)}_{3} {Cl}_{3}] . 3 H_{2} O$
B
$[Co {(H_{2} O)}_{6}] {Cl}_{3}$
C
$[Co {(H_{2} O)}_{5} Cl] {Cl}_{2} . H_{2} O$
D
$[Co {(H_{2} O)}_{4} {Cl}_{2}] Cl . 2 H_{2} O$

Solution

Depression in freezing point ${ΔT}_{f} = i . k_{f} . m$

For one molal soloution ; ${ΔT}_{f} \propto i$

$i$ is least for $[Co {(H_{2} O)}_{3} {Cl}_{3}] . 3 H_{2} O$ ; So ${ΔT}_{f}$ is least but freezing point is high.

Hence, the correct answer is option: 'A'.

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For 1 molal aqueous solution of the following compounds, which one will show the highest freezing point?

Solution

Relevant Questions

For $1 molal$ aqueous solution of the following compounds, which one will show the highest freezing point?