When a metal react with water it gives up hydrogen gas its reaction is
Mg + H2O = Mg(OH)2
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Mg+H2O = Mg(OH)2+H2
When magnesium react with water it release magnesium hydroxide and hydrogen gas.
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Mg + 2H2O ⇒ Mg(OH)2 + H2O
Magnesium starts floating as bubbles of hydrogen get stuck to the surface of the metal.
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