C-09-Q036mediumsingle_mcqMg+H2SO4→X+H2\mathrm{Mg + H_2SO_4 \rightarrow X + H_2}Mg+H2SO4→X+H2. Here X is—aMgSO4\mathrm{MgSO_4}MgSO4bMg(OH)2\mathrm{Mg(OH)_2}Mg(OH)