A．常温下，将铁片置于浓硝酸中：\(\rm{Fe+6HNO_{3}}\)\(\rm{=Fe(NO}\)\(\rm{{\,\!}_{3}}\)\(\rm{)}\)\(\rm{{\,\!}_{3}}\)\(\rm{+3NO}\)\(\rm{{\,\!}_{2}}\)\(\rm{↑+3H}\)\(\rm{{\,\!}_{2}}\)\(\rm{O}\)
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B．向氯化铵的浓溶液中加入\(\rm{NaOH}\)固体并加热：\(\rm{NH_{4}^{+}}\)\(\rm{+OH}\)\(\rm{{\,\!}^{-} \underset{∆}{\overset{}{=}}}\)\(\rm{NH}\)\(\rm{{\,\!}_{3}}\)\(\rm{↑+H}\)\(\rm{{\,\!}_{2}}\)\(\rm{O}\)
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C．向\(\rm{(NH_{4}}\)\(\rm{)}\)\(\rm{{\,\!}_{2}}\)\(\rm{SO}\)\(\rm{{\,\!}_{4}}\)溶液中加入适量\(\rm{Ba(OH)}\)\(\rm{{\,\!}_{2}}\)：\(\rm{Ba}\)\(\rm{{\,\!}^{2+}}\)\(\rm{+SO}\)\(\rm{{\,\!}_{4}^{2-}}\)\(\rm{=BaSO}\)\(\rm{{\,\!}_{4}}\)\(\rm{↓}\)
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D．向浓硝酸中加入铜片：\(\rm{Cu+4H^{+}}\)\(\rm{+2NO}\)\(\rm{{\,\!}_{3}^{-}}\)\(\rm{=Cu}\)\(\rm{{\,\!}^{2+}}\)\(\rm{+2NO}\)\(\rm{{\,\!}_{2}}\)\(\rm{↑+2H}\)\(\rm{{\,\!}_{2}}\)\(\rm{O}\) |