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

B

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G a

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I n

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A l

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Solution

The correct option is A $B$
B is unable to form $M F_{6}^{3 -}$ ion.
This is because $B^{3 +}$ has no vacant d orbitals. It has only on s and 3 p orbitals in the valence shell.
Hence, it can accept 4 electron pairs and can form $B F_{4}^{-}$ .
therefore option A is correct.

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