Question

Heavy snow can block traffic on road. It is difficult to melt the ice. Which of the following melts ice on roads even at temperatures below $0^{\circ }C$?

• A. Hydrated calcium chloride
• B. Hydrated magnesium sulphate
• C. Zinc oxide
• D. Bauxite

Answer 1

Answer: (A)

Hydrated calcium chloride

Hydrated $CaC{l}_2$ has the tendency in putting a temporary halt to the freezing process. It remains liquid at $0^0$ C, the temperature at which pure water would freeze.As saltwater mixture is more stable than salt-ice mixture, freezing won't occur until the temperature drops even lower.