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Gaokao Chemistry Practice Question

5. (6 分) $\mathrm{Mg}-\mathrm{AgCl}$ 电池是一种以海水为电解质溶液的水激活电池。下列叙述 错误的是 ( $)$

  1. A.负极反应式为 $\mathrm{Mg}-2 \mathrm{e}^{-}=\mathrm{Mg}^{2+}$
  2. B.正极反应式为 $\mathrm{Ag}^{+}+\mathrm{e}^{-}=\mathrm{Ag}$
  3. C.电池放电时 $\mathrm{Cl}^{-}$由正极向负极迁移
  4. D.负极会发生副反应 $\mathrm{Mg}+2 \mathrm{H}_{2} \mathrm{O}=\mathrm{Mg}(\mathrm{OH})_{2}+\mathrm{H}_{2} \uparrow$

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