Assume complete dissociation of electrolytes and ideal behaviour in water. Which of the following statements is/are correct?

A $0.10 m$ $K X_{2} SO X_{4}$ and $0.15 m$ glucose have the same freezing point.
B $0.10 m$ $NaCl$ and $0.20 m$ glucose have the same freezing point.
CThe boiling point elevation of $0.10 m$ $AlCl X_{3}$ is four times that of $0.10 m$ glucose.
D $0.10 m$ $CaCl X_{2}$ and $0.15 m$ $NaCl$ have the same boiling point.

Answer: B, C, D

Colligative effect

\propto i m

(particle molality).

NaCl

2 \times 0.10 = 0.20

equals glucose

0.20

CaCl X_{2}

3 \times 0.10 = 0.30

equals

NaCl

2 \times 0.15 = 0.30

AlCl X_{3}

has

i = 4

, four times glucose at the same molality.

K X_{2} SO X_{4}

gives

0.30

but

0.15 m

glucose gives only

0.15

, so the last statement is wrong.