Question

Lead storage battery contains $38 \%$ by weight solution of $H _2 SO _4$ The van't Hoff factor is $2.67$ at this concentration The temperature in Kelvin at which the solution in the battery will freeze is ______(Nearest integer) Given $K _f=1.8\, K \,kg\, mol ^{-1}$

Answer 1

The correct answer is 243.
ΔTf​=i.Kf​⋅m
⇒ΔTf​=2.67×1.8×9838​×621000​
⇒ΔTf​=30.05
∴F.P.=243K