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Write Equations for the Reactions Of Calcium and Potassium with Water - CBSE Class 10 - Science

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Question

 Write equations for the reactions of calcium and potassium with water

Solution

The reaction of calcium with water is exothermic but the heat evolved is not sufficient for the hydrogen to catch fire. 

Ca (s) + 2H2O (l) → Ca(OH)2 (aq) + H2 (g) + Heat

Calcium starts floating because the bubbles of hydrogen gas formed stick to the surface of the metal.
Potassium react violently with cold water and its reaction is so violent and exothermic that the evolved hydrogen immediately catches fire.

2K (s) + 2H2O (l) → 2KOH (aq) + H2 (g) + Heat

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APPEARS IN

 NCERT Solution for Science Textbook for Class 10 (2019 to Current)
Chapter 3: Metals and Non-metals
Q: 2.2 | Page no. 45
Solution Write Equations for the Reactions Of Calcium and Potassium with Water Concept: Metals and Nonmetals - Chemical Properties of Metals - When Metals React with Water.
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