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Gaokao Chemistry Practice Question

1.（6 分）下列叙述中正确的是（）

  1. A.液溴易挥发, 在存放液溴的试剂瓶中应加水封
  2. B.能使润湿的淀粉 $\mathrm{KI}$ 试纸变成蓝色的物质一定是 $\mathrm{Cl}_{2}$
  3. C.某溶液中加入 $\mathrm{CCl}_{4}, \mathrm{CCl}_{4}$ 层显紫色, 证明原溶液中存在 $\mathrm{I}^{-}$
  4. D.某溶液中加入 $\mathrm{BaCl}_{2}$ 溶液, 产生不溶于稀硝酸的白色沉淀, 该溶液一定含 有 $\mathrm{Ag}^{+}$

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