The Halogens

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1. Which of these statments is true?

  • Halogens bond to form an ionic diatomic molecule, X2+.
  • Halogens bond to form a covalent diatomic molecule, X2.
  • Halogens bond to form an ionic diatomic molecule, X2-.
  • Halogens do not bond.
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2. What happens in a 'displacement reaction'?

  • A more-reactive halogen will reduce and displace a halide of a less-reactive halogen.
  • A less-reactive halogen will reduce and displace a halide of a more-reactive halogen.
  • A more-reactive halogen will oxidise and displace a halide of a less-reactive halogen.
  • A less-reactive halogen will oxidise and displace a halide of a more-reactive halogen.

3. What colour and state is fluorine?

  • Pale yellow-green gas.
  • Pale yellow-green solid.
  • Red gas.
  • Brown liquid.

4. What is formed when a Group 7 element reacts with a metal?

  • Covalent halide with an X- ion.
  • Metallic halide with an X+ ion.
  • Ionic halide with an X- ion.
  • Ionic halide with an X+ ion.

5. Why do some people object to chlorination of water?

  • Chlorine is a toxic gas.
  • It prevents plants and vegetation from growing.
  • It is costly.
  • Sources of Chlorine are limiting.

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