What is not true about borax?

  1. A

    Molecular formula is Na2B4O710H2O.

  2. B

    Crystallic borax contains tetranuclear unit of B4O5(OH)42

  3. C

    It hydrolyses to give an acidic solution.

  4. D

    White crystalline solid.

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    Solution:

    Formula of borax is Na2B4O7.10H2O or Na2[B4O5(OH)4].8H2O. It is a white crystalline solid. On hydrolysis, borax gives a strong base and a weak acid.

    Na2B4O7+7H2O2NaOHStrong base+4B(OH)3Weak acid

    This indicates that after hydrolysis, boric makes a solution alkaline.

    Crystalline borax has a tetranuclear unit, B4O5(OH)42-.

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