[tex]2HCl + Mg -> MgCl_{2} + H_{2} \\\\H_{2}SO_{4} + Zn -> ZnSO_{4} + H_{2}\\\\2Al + 3H_{2}SO_{4} -> Al_{2}(SO_{4})_{3} + 3H_{2}\\\\3Na + H_{3}PO_{4} -> Na_{3}PO_{4} + H_{2}\\\\CaO + H_{2}S -> CaS + H_{2}O\\\\2Cr + 6HBr -> 2CrBr_{3} + 3H_{2}[/tex]
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