Question

why do metals like calcium and magnesium start floating during their reaction with water??​

Answer 1

When metals like calcium and magnesium are added to water bubbles are formed due to this it sticks on the surface of the water. Magnesium don't react with cold water, it reacts with hot water. The products are metal oxides and water. So metal oxides floats on water.

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Answer 2

Answer:

Calcium starts floating because the bubbles of hydrogen gas formed stick to the surface of the metal. Magnesium does not react with cold water. It reacts with hot water to form magnesium hydroxide and hydrogen. It also starts floating due to the bubbles of hydrogen gas sticking to its surface.