Question

calcium floats on water during the reaction with water give reason

Answer 1

During the reaction Hydrogen gas is released which tends to stick with the calcium solid by forming bubbles on its surface which results in an overall buoyant force which lifts the calcium solid.

Hope this will help...

Answer 2

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1. Calcium reacts with water less vigorously hence the heat evolved is not sufficient for hydrogen to catch fire.

2. Instead, calcium floats on water because the bubbles of hydrogen gas formed stick to the surface of the metal.

Hope it helps!

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