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An element A reacts with water to form a...

 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. 

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A is calcium it reacts with water to form calcium hydroxide which is used in white washing so B is `Ca(OH)_2`.
`Ca(s)+2H_2O(l)to Ca(OH)_2(aq)_B+H_2(g)`
On heating compound B, i.e., calcium hydroxide it forms calcium oxide i.e., C
`Ca(OH)_2to^(Heat)CaO_c+H_2O`
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