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प्रश्न
On reaction with dilute HCl, which of the following pair of metals will evolve hydrogen gas?
पर्याय
copper and zinc
copper and iron
silver and magnesium
magnesium and aluminium
MCQ
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उत्तर
Magnesium and aluminium
Explanation:
Metals above hydrogen in the reactivity series can displace hydrogen from dilute HCl and evolve hydrogen gas. Magnesium and aluminium are both above hydrogen, so they react with HCl to release H2 gas. Copper and silver are below hydrogen, so they do not react, while options containing them are incorrect.
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