Question

Sprinkling of salt helps in clearing the snow covered roads in hills. The phenomenon involved in the process is .........

(a) lowering in vapour pressure of snow

(b) depression in freezing point of snow

(c) melting of ice due to increase in temperature by putting salt

(d) increase in freezing point of snow

Answer 1

Answer : (b) depression in freezing point of snow

Explanation : When salt is sprinkled over a surface of snow covered roads, snow starts melting from the surface because depression of freezing point of water takes place due to addition of salt. It helps in clearing of roads. Hence, the phenomena is depression in freezing point which helps in clearing the snow covered roads in hilly areas.

Depression in freezing point which increases the freezing point of solution. 

b) depression in freezing point of snow