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Inorganic Chemistry (GATE)

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Which of the following statements are not correct about boron?

  1. Boron halides do not form dimers.
  2. Boron is a bad conductor of electricity.
  3. Boron exists in amorphous form only.
  4. The hydroxides and oxides of boron are amphoteric.
  5. The melting and boiling point of boron are lower than that of aluminium.
  6. Boron forms only covalent compounds.
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A
3, 4 and 5
💡 Explanation:

This option is correct because boron exists in both crystalline and amorphous forms. The hydroxides and oxides of boron are acidic, not amphoteric and the melting and boiling point of boron are much higher than that of Al.

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