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A．浓盐酸与铁屑反应： \(\rm{Fe+2H^{+}═Fe^{2+}+H_{2}↑}\) |
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B．磁性氧化铁溶于稀硝酸：\(\rm{3Fe^{2+}+4H^{+}+NO\rlap{_{3}}{^{-}}═3Fe^{3+}+NO↑+3H_{2}O}\) |
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C．\(\rm{H_{2}CO_{3}}\)电离：\(\rm{H_{2}CO_{3}═ H^{+}+HCO\rlap{_{3}}{^{-}}}\) |
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D．稀硫酸和氢氧化钡溶液反应：\(\rm{2H^{+}+SO_{4}^{2-}+Ba^{2+}+2OH^{-}=BaSO_{4}↓+2H_{2}O}\) |