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Gaokao Chemistry Practice Question

某白色固体混合物由 $\mathrm{NaCl} $、$ \mathrm{KCl} $、$ \mathrm{MgSO}_{4} $、$ \mathrm{CaCO}_{3}$ 中的两种组成, 进行如下实验: (1)混 合物溶于水, 得到澄清透明溶液; (2)做焰色反应, 通过钴玻璃可观察到紫色; (3)向溶液中加 碱, 产生白色沉淀。根据实验现象可判断其组成为

  1. A.$\mathrm{KCl} $、$ \mathrm{NaCl}$
  2. B.$\mathrm{KCl} $、$ \mathrm{MgSO}_{4}$
  3. C.$\mathrm{KCl} $、$ \mathrm{CaCO}_{3}$
  4. D.$\mathrm{MgSO}_{4} $、$ \mathrm{NaCl}$

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