An element A reacts with water to form a compound B which is used in white-washing.
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) + 2H2O(l) ------> Ca(OH)2(aq) + H2(g)
(B)
On heating compound B, i.e., calcium hydroxide, it forms calcium oxide, i.e., C.
Ca(OH)2 +Heat ----> CaO + H2O
(C)
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