Multiple choice

Identify the false statement(s):

  1. B-F bond in BF4- is shorter than BF3 molecule.
  2. Sodium tetraborate decahydrate is used as an indicator.
  3. Borazine is isoelectronic with benzene and exhibits D3h symmetry.

  1. Only 1

  2. Only 2

  3. Only 3

  4. 1 and 2

  5. 2 and 3
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  1. B-F bond is larger in BF4- than in BF3 molecule. This is due to the fact that in BF4-, the boron atom is sp3 hybridised while in BF3 the boron atom is sp2 hybridised and bond length decreases with increase in s-character as s-orbital is smaller than the p-orbital.
    1. Sodium tetraborate decahydrate or borax is not used as an indicator. Borax is used as a buffer because its aqueous solution contains equal amounts of weak acid and its salt.
    2. Borazine is isoelectronic with benzene and the symmetry point group in borazine is D3h. Hence, statements 1 and 2 both are false.

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