$12 \ g$ of $Mg$ (atomic mass $24$) will react completely with acid to give:
- AOne mole of $H_2$
- B$1/2$ mole of $H_2$
- C$2/3$ mole of $O_2$
- DBoth $1/2$ mol of $H_2$ and $1/2$ mol of $O_2$
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