Zinc liberates hydrogen gas


Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid whereas copper does not. Explain why ?


Zinc (Zn) is placed above hydrogen in the activity series. It therefore, displaces hydrogen from dilute HCl.

Zn (s) + 2HCl (aq) ————-> ZnCl2 (aq) + H2(g)

Copper is placed below hydrogen and therefore, does not react with dilute HCl.

Cu (s) + HCl (aq) ———–> No action.

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