How does sprinkling of salt help in clearing the snow-covered roads in hilly areas? Explain the phenomenon involved in the process.

(N/A) The phenomenon involved in clearing snow-covered roads is the $ \text{depression in freezing point} $ of water when a non-volatile solute is dissolved in it. When salt $( \text{NaCl} )$ is spread over snow-covered roads,it dissolves in the thin layer of water present on the surface of the ice. This increases the concentration of the solute,which lowers the freezing point of the water below the ambient temperature. Consequently,the ice melts even at temperatures below $ 0^{\circ}C $,helping to clear the roads.