An element A reacts with water to form a compound B which is used in whitewashing. 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.

Answer:

A is calcium, B is calcium Hydroxide, and C is Calcium Oxide.

Ca + 2H2O → Ca(OH)2 + H2

The above reaction is a combination reaction as calcium oxide and water combines to form a single product that is calcium hydroxide.

Ca(OH)2 → CaO + H2O

Ca(OH)2 on heating calcium oxide and water.

CaO + H2O → Ca(OH)2

This reaction is a combination reaction as calcium oxide, and water combines to form a single product that is calcium hydroxide.

  • A combination reaction is a reaction in which two reactants combine to form one product. Oxygen and halogens are very reactive elements and undergo combination reactions with other elements.
  • This is an exothermic chemical reaction and gives off heat.

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