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Answer:

Sample A: Iodine

Sample B: Bromine

Sample C: Chlorine.

Explanation:

  • Sample A is solid. So according to the melting and boiling points of iodine at 20°C, it will solid.
  • Sample B is liquid. Because according to the melting and boiling points of Bromine at 20°C, it will liquid.
  • Sample C is Gas. Because according to the melting and boiling points of Chlorine at 20°C, it will solid.

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