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Gaokao Chemistry Practice Question

3. 下列过程中的化学反应, 相应的离子方程式正确的是

  1. A.用碳酸钠溶液处理水垢中的硫酸铂: $\mathrm{CO}_{3}^{2-}+\mathrm{CaSO}_{4}=\mathrm{CaCO}_{3}+\mathrm{SO}_{4}^{2-}$
  2. B.过量铁粉加人稀硝酸中: $\mathrm{Fe}+4 \mathrm{H}^{+}+\mathrm{NO}_{3}^{-}=\mathrm{Fe}^{3+}+\mathrm{NO} \uparrow+2 \mathrm{H}_{2} \mathrm{O}$
  3. C.硫酸铝溶液中滴加少量氢氧化钾溶液: $\mathrm{Al}^{3+}+4 \mathrm{OH}^{-}=\mathrm{AlO}_{2}^{-}+2 \mathrm{H}_{2} \mathrm{O}$
  4. D.氯化铜溶液中通人硫化氢: $\mathrm{Cu}^{2+}+\mathrm{S}^{2-}=\mathrm{CuS} \downarrow$

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