Question

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 wan element a reacts with water to form a compound b which is used in white washing. The compound b on heating forms an oxide which on treatment with water gives back

b. Identify a, b and c and give the reactions involved..

Answer 1

substance used in white washing is calcium oxide
ca+h2o -ca(oh)2 +h2

Cao+h2o - ca(oh)2

then CA(oh)2 - Cao + h2o

Answer 2

Answer:

A - Calcium (Ca)

B - Calcium Hydroxide [Ca(OH)2]

C - Calcium Oxide (CaO)

Explanation:

* A + H2O ----> B + H2

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

* B + HEAT ----> C + H2O

[Ca(OH)2] + HEAT ----> CaO +H2O

* C + H2O ----> B

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

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