Answer:
These are expected to liberate
hydrogen from dilute acids due to their reducing nature as indicated by E°
values. But most of them react very slowly because of the formation of the
protective coating of their oxides on the surface. This coating is rather inert
and does allow the metals to react with dilute acids so readily to evolve
hydrogen gas.
\[M(s)+2{{H}^{+}}\,\underset{\begin{smallmatrix}
\\
\text{(Acid)}
\end{smallmatrix}}{\mathop{(aq)}}\,\xrightarrow{\,}\,{{M}^{2+}}(aq)+{{H}_{2}}(g)\]
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