which metals react with an acid to liberate hydrogen gas
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Metals placed above Hydrogen in the reactivity series is more reactive than Hydrogen so it displaces Hydrogen from its compound. Hence, metal liberate Hydrogen gas on reacting with water.
eg; Na + H2O = Na2O + H2
eg; Na + H2O = Na2O + H2
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when acid react with metal hydrogen gas is liberated .
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