Which metals react with dilute acid and liberate H_2 gas and whic…

Question

Which metals react with dilute acid and liberate $H_2$ gas and which metals do not release $H_2$ gas with dilute acid?

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Answer

The metal which is more reactive than hydrogen will liberate hydrogen gas during reaction with dilute acid.
For example,
$ \mathrm{Zn}(\mathrm{~s})+2 \mathrm{HCl}(\mathrm{aq}) \rightarrow \mathrm{ZnCl}_2(\mathrm{aq})+\mathrm{H}_2(\mathrm{~g}) $
$\mathrm{Mg}(\mathrm{~s})+2 \mathrm{HCl}(\mathrm{aq}) \rightarrow \mathrm{MgCl}_2(\mathrm{aq})+\mathrm{H}_2(\mathrm{~g}) $
$ \mathrm{Fe}(\mathrm{~s})+\mathrm{H}_2 \mathrm{SO}_4(\mathrm{aq}) \rightarrow \mathrm{FeSO}_4(\mathrm{aq})+\mathrm{H}_2(\mathrm{~g})$
The metal which is less reactive than hydrogen will not liberate hydrogen gas during reaction with dilute acid.
For example,
$4 \mathrm{Cu}(\mathrm{s})+10 \mathrm{HNO}_3(\mathrm{aq}) \rightarrow 4 \mathrm{Cu}\left(\mathrm{NO}_3\right)_2(\mathrm{aq})+\mathrm{N}_2 \mathrm{O}(\mathrm{g})+5 \mathrm{H}_2 \mathrm{O}(\mathrm{l})$

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