Q37Short answer
Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid, whereas copper does not. Explain why?
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Zinc is above hydrogen whereas copper is below hydrogen in the activity series of metals. That is why zinc displaces hydrogen from dilute hydrochloric acid, while copper does not. Zn + HCl ⎯→ ZnCl2 + H2 Cu + HCl ⎯→ No reaction