Question

The freezing point among the following equimolal aqueous solutions will be highest for

• A. $C_6{H}_{5}N{H}_{3}Cl$ (aniline hydrochloride)
• B. $Ca(N{O}_3{)}_2$
• C. $La(N{O}_3{)}_3$
• D. $C_6{H}_{12}{O}_6\left(glucose\right)$

Answer 1

Answer: (D)

$C_6{H}_{12}{O}_6\left(glucose\right)$

$C_6{H}_{5}N{H}_{3}Cl\to C_6{H}_{5}N{H}_3^{\oplus }+C{l}^{\ominus }Ca(N{O}_3{)}_2\to C{a}^{2+}+2N{O}_3^{\ominus }La(N{O}_3{)}_3\to L{a}^{3+}+3N{O}_3^{\ominus }$
Glucose does not dissociate. So it has the minimum number of particles, and therefore, it shows minimum depression in freezing point. So it has the maximum freezing point.