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Gaokao Chemistry Practice Question

下列指定反应的离子方程式正确的是

  1. A.室温下用稀 $\mathrm{NaOH}$ 溶液吸收 $\mathrm{Cl}_{2}: \mathrm{Cl}_{2}+2 \mathrm{OH}^{-}=\mathrm{ClO}^{-}+\mathrm{Cl}^{-}+\mathrm{H}_{2} \mathrm{O}$
  2. B.用铝粉和 $\mathrm{NaOH}$ 溶液反应制取少量 $\mathrm{H}_{2}: \mathrm{Al}+2 \mathrm{OH}^{-}=\mathrm{AlO}_{2}{ }^{-}+\mathrm{H}_{2} \uparrow$
  3. C.室温下用稀 $\mathrm{HNO}_{3}$ 溶解铜: $\mathrm{Cu}+2 \mathrm{NO}_{3}{ }^{-}+2 \mathrm{H}^{+}=\mathrm{Cu}^{2+}+2 \mathrm{NO}_{2} \uparrow+\mathrm{H}_{2} \mathrm{O}$
  4. D.向 $\mathrm{Na}_{2} \mathrm{SiO}_{3}$ 溶液中滴加稀盐酸: $\mathrm{Na}_{2} \mathrm{SiO}_{3}+2 \mathrm{H}^{+}=\mathrm{H}_{2} \mathrm{SiO}_{3} \downarrow+2 \mathrm{Na}^{+}$

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