`Ka_(1), Ka_(2)` and `Ka_(3)` are the respective constants for the following reactions
`H_(2)S hArr H^(+) + HS^(-)`
`HS^(-) hArr H^(+) + S^(2-)`
`H_(2)S hArr 2H^(+) + S^(2-)`
The correct relationship between `Ka_(1), Ka_(2)` and `Ka_(3)` is

Explanation

The dissociation of sulphuric acid in aqueous solution may be expressed as :
`H_(2)SO_(4)(aq) +H_(2)O (l) to H_(3)O^(+) (aq) +HSO_(4)^(-) (aq) , Ka_(1) gt 10`
`HSO_(4)^(-) (aq) +H_(2)O (l) to H_(3)O^(+)(aq) +SO_(4)^(2-) (aq) , Ka_(2)=1.2xx10^(-2)`
`HSO_(4)^(-)` ion left when the acid loses a proton, is negatively charged. It has lesser tendency to donate a proton to `H_(2)O` molecule.