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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.

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.

Answers (1)

Element A is calcium (Ca). When it reacts with water, it forms calcium hydroxide.
Ca+H_{2}O\rightarrow Ca\left ( OH \right )_{2}+H_{2}
Thus, compound B is calcium hydroxide [Ca(OH)2], which on heating gives CaO.
Ca\left ( OH \right )_{2}\rightarrow CaO+H_{2}O
Thus, C is calcium oxide (CaO)
Hence the answer is:
A: Calcium
B: Ca(OH)2
C: CaO

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