Which one of the following elements is unable to form MF 6 3 - ion?

Which one of the following elements is unable to form MF63- ion?
  1. B
  2. Al
  3. Ga
  4. In

Solution

MF63−
Boron belongs to 2nd period and it does not have vacant d-orbital.
It can form only 3 and 4 bond and cannot form 6 bond.

Asked in: NEET 2018

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