Is preferred over for clearing ice on roads

CHEMISTRY · Single correct · CBSE · Chemistry · Solutions · Solutions

Problem

\text{CaCl}_2

is preferred over

\text{NaCl}

for clearing ice on roads, particularly in very cold countries, because (1)

\text{CaCl}_2

is less soluble in

\text{H}_2\text{O}

than

\text{NaCl}

. (2)

\text{CaCl}_2

is hygroscopic but

\text{NaCl}

is not. (3) The eutectic mixture of

\text{CaCl}_2/\text{H}_2\text{O}

freezes at

-55^\circ\text{C}

, while that of

\text{NaCl}/\text{H}_2\text{O}

freezes at

-18^\circ\text{C}

. (4)

\text{NaCl}

makes the road slippery but

\text{CaCl}_2

does not.