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Preparation of Hydrogen

A student was...

Question

A student was given Mg, Zn, Fe and Cu metals. He puts each of them in dil.HCl contained in different test tubes. Identify which of them will be displaced from its salt solution by all other metals?

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Solution

Copper will be displaced from its salt solution by all other metals because $C u$ is less reactive than hydrogen so it can't displace it.

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