An element a reacts with water to form a compound b which is used in white washing. The compoundb on heating forms an oxide which on treatment with water gives back
b. Identify a, b and c andgive the reactions involved.
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a is Calcium
b is Calcium Hydroxide
c is Calcium oxide
Reactions
Ca+H20=Ca(Oh)2
Ca(OH)2= CaO +Co3
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Element A is calcium (Ca). When it reacts with water, it forms calcium hydroxide. Thus, compound B is calcium hydroxide [Ca(OH)2], which is used in white Washing
Ca(s) + 2H2O(l)
Compound B on heating gives CaO.
Ca(OH)2(aq) + H2(g)
Thus, C is calcium oxide (CaO).
C(CaO) on treatment with water gives back B [Ca(OH)2].
Ca(OH)2 +Heat ----> CaO + H2O
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