A) B
B) Al
C) Ga
D) In
Correct Answer: A
Solution :
\[\because \] 'B' has no vacant d-orbitals in its valence shell, so it can't extend its covalency beyond 4. i.e. 'B' cannot form the ion like \[\text{M}{{\text{F}}_{\text{6}}}^{\text{3(-)}}\] i.e. \[\text{B}{{\text{F}}_{6}}^{3(-)}\]. Hence, the correct option is [a].
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