First slide

Anomalous properties of Boron

Question

Which one of the following elements is unable to form $M F_{6}^{3 -} ion ?$

Easy

A

Ga
B

AI
C

B
D

In

Solution

Boron does not have vacant d -orbitals in its valence shell, so it cannot extend its covalency beyond 4. i.e., 'B' cannot form the ions like $M F_{6}^{3 -}$

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