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  4. Among Mg , Cu , Fe , Zn the metal that does not produce hydrogen gas in reaction with hydrochloric acid is

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Q. Among $Mg , Cu , Fe , Zn$ the metal that does not produce hydrogen gas in reaction with hydrochloric acid is

KVPYKVPY 2015

Solution:

The metals that are present below hydrogen in reactivity series will not produce hydrogen gas in reaction with hydrochloric acid. Among the given metals, $Cu$ is present below $H$ in reactivity series, i.e. it is less reactive than $H$, will not produce $H _{2}$ gas in reaction with $HCl$ acid.