\( \mathrm{CaCl}_{2} \) is preferred over for clearing ice on roads particularly in very cold co....

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\( \mathrm{CaCl}_{2} \) is preferred over for clearing ice on roads particularly in very cold countries. This is because:
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(1) \( \mathrm{CaCl}_{2} \) is less soluble in \( \mathrm{H}_{2} \mathrm{O} \) than \( \mathrm{NaCl} \)
(2) \( \mathrm{CaCl}_{2} \) is hygroscopic but \( \mathrm{NaCl} \) is not
(3) Eutectic mixture of \( \mathrm{CaCl}_{2} / \mathrm{H}_{2} \mathrm{O} \) freezes at \( -55^{\circ} \mathrm{C} \) while that of \( \mathrm{NaCl} / \mathrm{H}_{2} \mathrm{O} \) freezes at \( -18^{\circ} \mathrm{C} \)
(4) \( \mathrm{NaCl} \) makes the road slipperty but \( \mathrm{CaCl}_{2} \) does not


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