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Why does magnesium ribbon start floating on hot water? |
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Answer» magnesium is not more reactive as calcium hence calcium can react with react with cold water but magnesium cannot is can react with hot water .So when it reacts with hot water it forms magnesium hydroxide and hydrogen .The hydrogen gas evolved doesn't catch fire because the heat evolved is very low . But it forms bubbles and stick to the surface of magnesium and thus as a result magnesium starts floating on water due to the hydrogen gas.hence magnesium ribbon start floating on water. |
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