Multiple choice

Which of the following statements is/are not false?

  1. Bromine pentafluoride is colourless liquid and does not react with glass.
  2. Iodine trifluoride is a yellow powder, decomposes above −28 °C.
  3. Iodine pentafluoride (IF5) is a colourless gas with tetragonal pyramid shape and react with glass.

  1. Only 1

  2. Only 3

  3. Only 1 and 2

  4. Only 1 and 3

  5. All of these
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation
  1. Bromine pentafluoride (BrF5) is a colourless fuming liquid, made by reacting bromine trifluoride with fluorine at 200 °C. It is physically stable, but reacts violently with water and most metals and non-metals. It does not react with glass.
    1. Iodine trifluoride (IF3) is a yellow powder, which decomposes above −28 °C.
    2. Iodine pentafluoride (IF5) is a colourless liquid, made by reacting iodine pentoxide with fluorine, or iodine with silver(II) fluoride. It is highly reactive, even slowly with glass. It reacts with elements, oxides and carbon halides. The molecule has the form of a tetragonal pyramid. Hence, the statements 1, 2 and 3 all are true.

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