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05/11/2020 6:22 pm
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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. ‘A’ is calcium metal, ‘B’ is calcium hydroxide, ‘C’ is calcium oxide.
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05/11/2020 6:27 pm
Ca(s)('A') + 2H2O(l) → Ca(OH)2(aq)('B') + H2(g)
'B' Ca(OH)2 is used in while washing.
Ca(OH)2(aq)('B') + heat → CaO(s) + H2O(l)
CaO(s)('c') + H2O(l) → Ca(OH)2(aq)('B')