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Gaokao Chemistry Practice Question

镀锌铁钉放入棕色的碘水中, 溶液褪色; 取出铁钉后加入少量漂白粉, 溶液恢复棕色: 加入 $\mathrm{CCl}_{4}$, 振 荡, 静置, 液体分层。下列说法正确的是

  1. A.褪色原因为 $\mathrm{I}_{2}$ 被 $\mathrm{Fe}$ 还原
  2. B.液体分层后, 上层呈紫红色
  3. C.镀锌铁钉比镀锡铁钉更易生锈
  4. D.溶液恢复棕色的原因为 $\mathrm{I}^{-}$被氧化

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