Question

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

• A. $A{l}_2{\left(S{O}_4\right)}_3$
• B. $C_6{H}_{12}{O}_6$
• C. $KI$
• D. $K_{2}S{O}_4$

Answer 1

Answer: (A)

$T_f-T_f^{\prime }=i{K}_{f}m$
For minimum $T_f^{\prime }$
'$i$' should be maximum.
$A{l}_2{\left(S{O}_4\right)}_{3}i=5$
$C_6{H}_{12}{O}_{6}i=1$
$KIi=2$
$K_{2}S{O}_{4}i=3$