$_______+ dil . HCl \to {MgCl}_{2} +_____$

$Mg$

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$H_{2}$

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Solution

Less active metals (but lying above hydrogen in the activity series) like magnesium, zinc and iron react at room temperatures and produce hydrogen gas. The corresponding metal salt is also formed.
Therefore, $Mg + 2 HCl (dil .) \to {MgCl}_{2} + H_{2}$ .

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