Question:
On reaction with dilute HCl, which of the following pair of metals will evolve hydrogen gas?
On reaction with dilute HCl, which of the following pair of metals will evolve hydrogen gas?
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Metals above hydrogen in reactivity series evolve H$_2$ with acids.
Updated On: Feb 26, 2026
- Copper and zinc
- Copper and iron
- Silver and magnesium
- Magnesium and aluminium
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The Correct Option is D
Solution and Explanation
Concept:
Metals above hydrogen in the reactivity series react with dilute acids to produce hydrogen gas. Metals below hydrogen do not displace hydrogen from acids.
Explanation:
- Copper and silver are below hydrogen → Do not evolve H$_2$.
- Zinc, iron, magnesium, and aluminium are above hydrogen → Evolve H$_2$.
- Only the pair where both metals react is magnesium and aluminium.
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