1.

Boron cannotform whichone of the following anions ?

Answer»

`BF_(6)^(3-)`
`BH_(4)^(-)`
`B(OH)_(4)^(-)`
`BO_(2)^(-)`

Solution :DUE to ABSENCE of d-orbitals , B cannot EXTEND its covalency beyond 4and hence it can FORM `BF_(4)^(-), [B(OH)_(4)]^(-)`and `BO_(2)^(-)`but not `BF_(6)^(3-)`.


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