1.

Which of the following is non -existent

Answer»

`AlF_(6)^(3-)`
`COF_(6)^(3-)`
`BF_(6)^(3-)`
`SiF_(6)^(2-)`

Solution :Maximum covalency of B is only 4as it does not have d-orbitals `(1S^(2)2s^(2)2P^(1))`


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