A substance ?X? is used in white-washing and is obtained by heating limestone in the absence of air. Identify ?X?.
(a) CaOCl2
(b) Ca (OH)2
(c) CaO
(d) CaCO3

Dear Student

Solution of CaO is used in white washing. So, X is CaO.
CaCO3 + Heat = CaO + CO2


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option b c(oh)2
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