A. Mg(s)+H2SO4(aq)→MgSO4(aq)+H2(g)\mathrm{Mg}(\mathrm{s})+\mathrm{H}_{2} \mathrm{SO}_{4}(\mathrm{aq}) \rightarrow \mathrm{MgSO}_{4}(\mathrm{aq})+\mathrm{H}_{2}(\mathrm{g})Mg(s)+H2SO4(aq)→MgSO4(aq)+H2(g)
B. Mg(s)+2 H2SO4(aq)→Mg(SO4)2(aq)+2H2(g)\mathrm{Mg}(\mathrm{s})+2 \mathrm{~H}_{2} \mathrm{SO}_{4}(\mathrm{aq}) \rightarrow \mathrm{Mg}\left(\mathrm{SO}_{4}\right)_{2}(\mathrm{aq})+2 \mathrm{H}_{2}(\mathrm{g})Mg(s)+2 H2SO4(aq)→Mg(SO4)2(aq)+2H2(g)
C. Mg(s)+H2SO4(aq)→MgSO3(aq)+H2O(ℓ)\mathrm{Mg}(\mathrm{s})+\mathrm{H}_{2} \mathrm{SO}_{4}(\mathrm{aq}) \rightarrow \mathrm{MgSO}_{3}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\ell)Mg(s)+H2SO4(aq)→MgSO3(aq)+H2O(ℓ)
D. Mg(s)+2 H2SO4(aq)→Mg(SO3)2(aq)+2 H2O(ℓ)\mathrm{Mg}(\mathrm{s})+2 \mathrm{~H}_{2} \mathrm{SO}_{4}(\mathrm{aq}) \rightarrow \mathrm{Mg}\left(\mathrm{SO}_{3}\right)_{2}(\mathrm{aq})+2 \mathrm{~H}_{2} \mathrm{O}(\ell)Mg(s)+2 H2SO4(aq)→Mg(SO3)2(aq)+2 H2O(ℓ)
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