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MolSynapse / Question bank / p-Block Elements: Groups 13 and 14 / Boron compounds: diborane, boric acid, borax, boron halides
JEE Main levelOne or more correct optionsDifficulty 2 of 3pb031

Select the correct statement(s) about borax.

  1. AAll four boron atoms in its anion are hybridised.
  2. BIts aqueous solution is alkaline.
  3. COn heating it swells and finally forms a transparent glassy bead.
  4. DIts anion is .

Answer: B, C, D

The anion is , so A is true. Borate hydrolyses to give and so the solution is alkaline, so B is true. Borax loses water, swells and fuses to a glassy mass of and , so C is true. Two B atoms are (trigonal) and two are (tetrahedral), so D is false.
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