Is the following acid-base reaction Arrhenius, Bronsted-Lowry, or Lewis: H2SO4 + NH3 --> HSO4- + NH4+
It's all three......
(i) Arrhenius defined the acidium ion as
(ii) Bronsted and Lowry defined the acid base reaction on the basis of proton transfer between acids and bases....
(iii) Lewis defined the acid as an electron pair acceptor, and the base as an electron-pair donor.
For the reaction.....
...we can rationalize the observed reactivity on the basis of all three definitions.