A) \[CaC{{l}_{2}}\] is less soluble in \[{{H}_{2}}O\] than \[NaCl\]
B) \[CaC{{l}_{2}}\] is hygroscopic but\[NaCl\] is not
C) eutectic mixture of\[CaC{{l}_{2}}\text{/}{{H}_{2}}O\]freezes at \[-\ 55{}^\circ C\] while that of \[NaCl\text{/}{{H}_{2}}O\] freezes at\[-18{}^\circ C\]
D) \[NaCl\] makes the road slippery but \[CaC{{l}_{2}}\] does not
Correct Answer: C
Solution :
\[CaC{{l}_{2}}\] is preferred to \[NaCl\] for clearing ice on roads particularly in very cold countries. This is because eutectic mixture of \[CaC{{l}_{2}}\text{/}{{H}_{2}}O\]freezes at a much lower temperature \[-\,55{}^\circ C\] while that of \[NaCl\text{/}{{H}_{2}}O\] freezes at \[-\,18{}^\circ C\]
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