Which one of the following is correct statement ?

  1. A

    The hydroxide of aluminium is more acidic than that of boron.

  2. B

    The hydroxide of boron is basic, while that of aluminium is amphoteric.

  3. C

    The hydroxide of boron is acidic, while that of aluminium is amphoteric.

  4. D

    The hydroxide of boron and aluminium are amphoteric

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    Solution:

    Boron is the only non-metal in group-13 and its hydroxide is acidic. Boron hydroxide is formed when borax is treated with acid in the presence of water. On heating, boric hydroxide forms meta-boric acid.

    B(OH)3HBO2Metaboric acid+H2O

    Aluminum hydroxide is amphoteric because it reacts with both acid and base.

    Al(OH)3+3HClAlCl3+3H2OAl(OH)3+NaOHNaAlO2+2H2O

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