why is hydrogen gas liberated when metal reacts with water and not when metal oxide reacts with water
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because when metal reacts with water then explosive violence and strong evolution of heat and light. Some time ago the former of us found that during the interaction of these two metals a considerable quantity of hydrogen gas is formed and that the sudden liberation and oxidation of this gas accounts for the explosion accompanying the reaction while Some metals react with water and produce metal oxides or hydroxides and liberate hydrogen gas. ... However, calcium reacts less violently with cold water because it is less reactive as compared to Na and K Magnesium does not react with cold water. It reacts with hot water to form magnesium hydroxide and hydrogen gas.
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Hydrogen gas liberated when metal reacts with water .
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