Select polybasic Arrhenius acids form the following `:H_(3)PO_(2),H_(3)PO_(3),H_(3)BO_(3),HCOOH,(COOH)_(2)`
b Write conjugate acids of `SO_(4)^(2-),RNH_(2),NH_(2)^(-),C_(2)H_(5)OC_(2)H_(5),F^(-)`
c Write conjugate base of `HNO_(2),OH^(-),H_(2)CO_(3),HClO_(4)`
d Write conjugate acid and conjugate base of following amphoteric species:
`HS^(-),NH_(3).C_(2)H_(5)OH,H_(2)O`
e Classify the following into Lewis base :`H^(+),FeCl_(3),(CH_(3))_(3)N,F,CH_(2)`

Explanation

Polybasic Arrhenius acids produce more than one `H^(+)` ion per acid molecule when dissolved in water .On removel of one `H^(+)` from an acid ,we get its conjugate base,On addition of one `H^(+)` to a base we get its conjugate acid .