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JEE Main2011Chemistryp Block Elements (Group 13 & 14)Actual

Boron cannot form which one of the following anions?

Options

  1. ABH ₄⁻
  2. BB ( OH )₄⁻
  3. CBO ₂⁻
  4. DBF ₆³⁻

Correct answer

D. BF ₆³⁻

Step-by-step solution

As Boron has only four orbitals in the valence shell ( i.e. 2 s, 2 p_x, 2 p_y & 2 p_z ) it can show a maximum valency of four only. Therefore [ BF ₆ ]³⁻ is not possible

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