Why does adding magnesium to hydrochloric acid form hydrogen gas?

I am doing a practical science write up for school and we have to include inferences (why the reaction happened) I need fast answers please help me out!!! When you add magnesium to hydrochloric acid it forms hydrogen gas?? why??

Answer #1

2HCl + Mg =MgCl2 + H2

Answer #2

Magnesium replaces the hydrogen in hydrochloric acid. This frees up the hydrogen as gas.

HCl + Mg = MgCl and H

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