Verified Answer :

the gas produced when the two combine is h2

Answer: \(H_2\) or Hydrogen

Explanation:-

\(Mg(s)+2HCl(aq)\rightarrow MgCl_2(aq)+H_2(g)\)

This is a single replacement reaction in which magnesium replaces hydrogen from its aqueous solution. As magnesium is more reactive than hydrogen , it easily loses electrons to convert to \(Mg^{2+}\) in \(MgCl_2\) and \(H^+\) in \(HCl\) accepts electrons to form \(H_2\).

Thus magnesium when dropped into an aqueous solution of \(HCl\) releases hydrogen gas.

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