Which of the following will have the highest depression in freezing point when their concentration is $0.1 \ M$?

For $0.01 \, M$ solutions of urea, common salt $(NaCl)$, and $Na_2SO_4$, the ratio of depression of freezing point is:

Consider the following solutions at $25\,^oC$:
$(I)$ $0.01\, M$ aqueous solution of glucose
$(II)$ $0.01\, M$ aqueous solution of $KNO_3$
$(III)$ $0.01\, M$ solution of acetic acid in benzene
Select the correct statement.

If $1$ mole of a solute dissociates to give $n$ number of ions,then the degree of dissociation $\alpha$ in terms of the van't Hoff factor $i$ is given by:

Which one of the following $0.06 \ M$ aqueous solutions has the lowest freezing point?

The molal elevation constant of water is $0.51 \ K \ kg \ mol^{-1}$. The boiling point of a $0.1 \ m$ aqueous $NaCl$ solution is approximately ......... $^oC$.