Question

Magnesium when reacts with hot water starts floating. Explain.

Answer 1

Explanation:

Magnesium metal does not react with cold water. it react with hot water to form magnesium hydroxide and hydrogen.

Mg + 2H2O ------Mg(OH)2 + H2

in this reaction a piece of magnesium metal starts floating in water due to the bubbles of hydrogen gas sticking to its surface.

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