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# Slaked lime is obtained when water is added to

$\begin{array}{1 1}(a)\;CaSO_4\large\frac{1}{2}\normalsize H_2O&(b)\;CaCl_2\\(c)\;CaO&(d)\;CaCO_3\end{array}$

Slaked lime is calcium hydroxide .
It is obtained when water is added to $CaO$(lime)
$CaO+H_2O\rightarrow CaCO_2$
$Mg_2C_3+4H_2O\rightarrow 2Mg(OH)_2+CH_2-C\equiv CH$
Hence (c) is the correct answer.