Which species doesnot exist

1.	Which species doesnot exist
Answer» `[BF_(6)]^(3-)` `[AlF_(6)]^(3-)` `[GaF_(6)]^(3-)` `[InF_(6)]^(3-)` Solution :`BF_(3)` cannot accept MORETHAN are `F^(-)` ion DUE to non avilability of vacant - d - ORBITAL. This is because MAXIMUM covalency of boran is FOUR.

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