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CaCl₂ is preferred over NaCl for clearing ice on roads particularly in very cold countries. This is because :

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CaCl₂ is less soluble in H₂O than NaCl

CaCl₂ is hygroscopic but NaCl is not

Eutectic mixture of CaCl₂/H₂O freezes at-55°C while that of NaCl/H₂O freezes at-18°C

NaCl makes the road slipperty but CaCl₂ does not

answer is C.

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Detailed Solution

Due to much lower freezing point of eutectic mixture of CaCl₂/H₂O.

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