Question
Name a calcium compound which hardens on wetting with water.
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$2\text{K}\ +\ \text{Cl}_2\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }2\text{KCl}$
$ \ \ \ \ \ \ \ \ \text{H}\\ \ \ \ \ \ \ \ \ \ \text{|}\\ \text{H}-\text{C}=\text{O}$