Which of the following is widely used for treating ice on roads, particularly in very cold countries?

Options

A. `CaCl_(2)` is less soluble in `H_(2)O ` than NaCl
B. `CaCl_(2)` is hygroscopic but NaCl is not
C. Eutectic mixture of `CaCl_(2)"/"H_(2)O` freezes at `-55^(@)C` while that of `NaCl"/"H_(2)O` freezes at `-18^(@)C`
D. NaCl makes the road slipperty but `CaCl_(2)` does not

Answer

C

Explanation

Due to much lower freezing point of neuteric mixture of `CaCl_(2)"/"H_(2)O`.