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  4. The solution having lowest freezing point is

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Q. The solution having lowest freezing point is

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Solution:

Depression in freezing point is a colligative property.
Higher the value of $i$, higher will be depression in freezing point and lowest will be the freezing point of solution.
For $K C l, \,\,\, i=2$
$KNO _{3}, \,\,\, i=2$
$K _{2} SO _{4} \,\,\, i=3$
$A l_{2}\left(S O_{4}\right)_{3} \,\,\, i=5$