Question

$CaC{l}_2$ is preferred over $NaCl$ for clearing ice on roads on particularly in very cold countries. This is because:

• A. $CaC{l}_2$ is not soluble in $H_{2}O$ than $NaCl$
• B. $CaC{l}_2$ is hygroscopic but $NaCl$ is not
• C. eutectic mixture of $CaC{l}_2$/$H_{2}O$ freezes at $-{55}^{o}C$ while that of $NaCl$/$H_{2}O$ freezes at $-{18}^{o}C$
• D. $NaCl$ makes the road slippery but $CaC{l}_2$ does not

Answer 1

Answer: (C)

eutectic mixture of $CaC{l}_2$/$H_{2}O$ freezes at $-{55}^{o}C$ while that of $NaCl$/$H_{2}O$ freezes at $-{18}^{o}C$

$CaC{l}_2$ is preferred over $NaCl$ for clearing ice on roads on particularly in very cold countries due to much lower freezing point of eutectic mixture of $CaC{l}_2/H_{2}O$.