Question 2 Page 46 (ii) - Chapter 3 Class 10 - Metals and Non-Metals

Last updated at August 4, 2026 by

Write equations for the reactions of

(ii) calcium and potassium with water

 

Answer

(ii) Calcium and Potassium with water

 

Calcium

Calcium reacts with cold water to form Calcium Hydroxide and Hydrogen gas .

  • Heat formed in this reaction is less violent and does not produce sufficient heat for hydrogen gas to catch fire.
  • The piece of Calcium metal floats in water , because bubbles of hydrogen gas formed in the reaction, stick to the surface.

 

Potassium

Potassium reacts violently with cold water to form Potassium Hydroxide , Hydrogen Gas and heat energy. 

  • The reaction is very exothermic and produces large amounts of heat.
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