Multiple choice

Which of the following statements is/are incorrect? A) Chlorine monofluoride is a colourless gas with boiling point of -100 °C. B) Iodine trichloride molecule is a planar dimer, with each iodine atom is surrounded by four chlorine atoms. C) Iodine monofluoride is brown red solid.

  1. Only A

  2. Only B

  3. Only C

  4. Only A and B

  5. Only B and C
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A) Chlorine monofluoride (ClF) is the lightest interhalogen compound. ClF is a colourless gas with a normal boiling point of −100 °C. B) Iodine trichloride (ICl3) forms lemon orange crystals, which can be melted under pressure to a brown liquid. It can be made from the elements at low temperature, or from iodine pentoxide and hydrogen chloride. It reacts with many metal chlorides to form tetrachloroiodides, and hydrolyses in water. The molecule is a planar dimer (ICl3)2, with each iodine atom surrounded by four chlorine atoms. C) Iodine monofluoride (IF) is very unstable gas and detected only by spectroscopically. It decomposes at 0 °C, disproportionating into elemental iodine and iodine pentafluoride. β-form of ICl is brown red crystalline solid. Hence, only statement C is false.

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