Question

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An element A reacts with water to form 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 reaction involved​

Answer 1

element A ic calcium(Ca)

compound B is Ca(OH)₂

oxide C is CaO

please refer to the reactions given below for better understanding

Ca + 2H₂O → Ca(OH)₂ + H₂

Ca(OH)₂ → CaO + H₂O                 on heating

CaO + H₂O → Ca(OH)₂

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Answer 2

A is Calcium, B is Calcium Hydroxide or Ca(OH)2

C is Calcium Oxide or CaO

Ca + H2O------> Ca(OH)2 + H2

Ca(OH)2---------> CaO + H2O

(heat)