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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 give $H_{2}$ with $5 %$ $H N O_{3}$

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Solution

$M g$ will give $H_{2}$ with $5 % H N O_{3}$ because only $M n$ and $M g$ will react with $H N O_{3}$ .

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