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Preparation of Hydrogen

Hydrogen is e...

Question

Hydrogen is evolved when dilute $H C l$ reacts with magnesium, but nothing happens in the case of mercury and silver. Explain.

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Solution

Hydrogen is evolved when dilute $H C l$ reacts with magnesium, but nothing happens in the case of mercury and silver because metals which are more reactive than hydrogen can displace it from $H C l$ .

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