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Which out of the following statements is not correct for anhydrous calcium chloride ?

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It is prepared by heating hydrated calcium chloride above 533 K

It is used for drying alcohols and ${NH}_{3}$

It is used as a dehydrating agent to control snow and ice on highway and pavements

When mixed in concrete, it gives quicker initial setting and improves its strength

answer is B.

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Detailed Solution

Anhydrous ${CaCl}_{2}$ is not used for drying alcohol as it forms ${CaCl}_{2} . 4 C_{2} H_{5} OH$ and also reacts with ${NH}_{3}$ .

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