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Gaokao Chemistry Practice Question

常温下, 下列各组离子在给定溶液中能大量共存的是

  1. A.$\mathrm{pH}=1$ 的溶液: $\mathrm{Fe}^{2+} $、$ \mathrm{Mg}^{2+} $、$ \mathrm{SO}_{4}^{2-} $、$ \mathrm{NO}_{3}^{-}$
  2. B.$\mathrm{pH}=12$ 的溶液: $\mathrm{K}^{+} $、$ \mathrm{Na}^{+} $、$ \mathrm{NO}_{3}^{-} $、$ \mathrm{CO}_{3}^{2-}$
  3. C.$\mathrm{pH}=7$ 的溶液: $\mathrm{Na}^{+} $、$ \mathrm{Cu}^{2+} $、$ \mathrm{~S}^{2-} $、$ \mathrm{Cl}^{-}$
  4. D.$\mathrm{pH}=7$ 的溶液: $\mathrm{Al}^{3+} $、$ \mathrm{~K}^{+} $、$ \mathrm{Cl}^{-} $、$ \mathrm{HCO}_{3}^{-}$

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