1.

Which of the following species cannot have conjugate base ?

Answer»

`HSO_(4)^(-1)`
`HPO_(4)^(-2)`
`PO_(4)^(-3)`
`H_(2)PO_(2)^(-)`

Solution :`PO_(4)^(-3)` has only conjugate acid, that is `HPO_(4)^(-2)`. It has no conjugate base as it does not possess any replaceable `H^(+)` ION


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