Discussion
Slaked lime is
Answer: C
Slaked lime is Ca(OH)2, calcium hydroxide.
Quicklime (CaO) reacts vigorously with water, slaking, to give calcium hydroxide:
\[ \mathrm{CaO + H_{2}O \rightarrow Ca(OH)_{2}} \]
CaO is quicklime, CaCO3 is limestone (chalk, marble), and Ca(HCO3)2 is calcium bicarbonate, which causes temporary hardness of water.
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