In winter, the normal temperature in Dharmshala is `- 8^(@)` C Is a `30%` by mass of an aqueous solution of ethylene glycol (molar mass = 62) suitable for car radiator . `K_(f)` for water is 1 . 86 K/m

Explanation

Mass of solute = 30 g , Volume of solvent = 70 g , `K_(f)=1.86"K/m"`
`DeltaT_(f)=(K_(f)xxW_(B)xx1000)/(M_(B)xxW_(A))=(1.86xx30xx1000)/(62xx70)=12.8K`
Since this solution freezes at `-12.8^(@)C` where as temperature of Dharmshala is `-8^(@)C` hence this solution for car radiator.