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JEE Main 2011
Exam
JEE Main
Year
2011
Subject
Chemistry
Chapter
p Block Elements (Group 13 & 14)

JEE Main 2011 · Chemistry · p Block Elements (Group 13 & 14)

Boron cannot form which one of the following anions?

Boron cannot form which one of the following anions?

Options

  1. ABH4−\mathrm{BH}_4^{-}
  2. BB(OH)4−\mathrm{B}(\mathrm{OH})_4^{-}
  3. CBO2−\mathrm{BO}_2^{-}
  4. DBF63−\mathrm{BF}_6^{3-}

Correct answer

D. BF63−\mathrm{BF}_6^{3-}

Step-by-step solution

As Boron has only four orbitals in the valence shell ( i.e. 2s,2px,2py&2pz2 s, 2 p_x, 2 p_y \& 2 p_z ) it can show a maximum valency of four only. Therefore [BF6]3−\left[\mathrm{BF}_6\right]^{3-} is not possible
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