For 1molal aqueous solution of the following compounds, which one...

For

1molal

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

Options

A $\left[Co{\left({H}_{2}O\right)}_{3}{Cl}_{3}\right] . 3{H}_{2}O$
B\left[Co{ $\left({H}_{2}O\right)}_{6}\right]{Cl}_{3}$
C $\left[Co{\left({H}_{2}O\right)}_{5}Cl\right]{Cl}_{2} . {H}_{2}O$
D $\left[Co{\left({H}_{2}O\right)}_{4}{Cl}_{2}\right]Cl . 2{H}_{2}O$

Correct answer

A. $\left[Co{\left({H}_{2}O\right)}_{3}{Cl}_{3}\right] . 3{H}_{2}O$

Step-by-step solution

Depression in freezing point ${\Delta T}_{f} = i . {k}_{f} . m$

For one molal soloution ; ${\Delta T}_{f} ∝ i$

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

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