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Explain why calcium metal after reacting...

Explain why calcium metal after reacting with water starts floating on its surface. Write the chemical equation for the reaction.

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Calcium reacts with water to evolve hydrogen gas. Bubbles of the gas stick on the surface the metal. As a result, it starts floating on the surface of water :
`Ca(s) + 2H_(2)O(l) rarr Ca(OH)_(2)(s) + H_(2)(g)`
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