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Question
An element A reacts with water to form a compound B which is used in white washing. The compound B on heating forms an oxide C which on treatment with water gives back B. Identify A, B and C and give the reactions involved.
Solution
A is calcium, B is calcium hydroxide and C is calcium oxide.
`"Ca"("s") + 2"H"_2"O"("l") -> "Ca"("OH")_2("aq") + "H"_2("g")`
`"Ca"("OH")_2("s")overset("Heat")(->) "CaO"("s") + "H"_2"O"("g")`
`"CaO"("s") + "H"_2"O"("I") -> "Ca"("OH")_2("aq")`
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