Question
Which of the following has the highest freezing point ?
A.
$$1\,m\,NaCl\,\,{\text{solution}}$$
B.
$$1\,m\,KCl\,\,{\text{solution}}$$
C.
$$1\,m\,AlC{l_3}\,\,{\text{solution}}$$
D.
$$1\,m\,{C_6}{H_{12}}{O_6}\,\,{\text{solution}}$$
Answer :
$$1\,m\,{C_6}{H_{12}}{O_6}\,\,{\text{solution}}$$
Solution :
$${C_6}{H_{12}}{O_6}$$ is a non-electrolyte hence furnishes minimum number of particles and will have maximum freezing point.
$$\Delta {T_f} = i{K_f}m\,\,\,\,{\text{or}}\,\,\,\Delta {T_f} \propto i\,\,\,\,{\text{and}}\,\,\,\Delta {{\text{T}}_f} = T_f^ \circ - {T_f}$$