1.

If an acid-base reaction `HA(aq)+B^(-)(aq)hArr HB(aq)+A^(-)(aq)` has `K_(aq)=10^(-4)`.how many of the following statements are true? (i) `HB` is stronger acid than `HA` (ii) `HA` is stronger acid than `HB` (iii) `HA` and `HB` have the same acidic strength (iv) `B^(-)` stronger base than `A^(-)` (v) `A^(-)` is stronger base than `B^(-)` (vi) `B^(-)` and `HB` are conjugate acid-base pair (vii) `A^(-)` is the conjugate base of acid `HA`. (viii)`HA` can be`HSO_(4)^(-)` and `HB` can be `HCOOH`. `A^(-)` can be `F^(-)` and `B^(-)` can be `CN^(-)`

Answer» `HA(aq)+B^(-)(aq)hArr HB(aq)+A^(-)(aq)" "K_(eq)=10^(-4)`
`K_(eq)` is very small .So reaction shift in backward direction.
`(1) HB` is more stronger acid than `HA`
(2) `A^(-)` is more stronger base than `B^(-)`
(3) `B^(-)` and `HB` are conjugate acid-base pair.


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