why magnesium starts floating when react with water
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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.
Answered by
1
Answer:
Magnesium reacts with water to form magnesium hydroxide and hydrogen gas as:
Mg+2H
2
O→Mg(OH)
2
+H
2
The hydrogen gas evolved due to this reaction sticks on the surface of magnesium ribbon making it float in hot water.
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