Which compounds are classified as Arrhenius acids?
(1) HCl and NaOH
(2) HNO3 and NaCl
(3) NH3 and H2CO3
(4) HBr and H2SO4

Answer:The correct answer is option 4.Explanation:Arrhenius acids are those compounds which gives [tex]H^+[/tex] ions when dissolved in their aqueous solution.[tex]HA(aq)\rightarrow H^++A^-[/tex]Arrhenius bases are those compounds which gives [tex]OH^-[/tex] ions when dissolved in their aqueous solution.[tex]BOH(aq)\rightarrow OH^-+B^+[/tex][tex]HBr \& H_2SO_4[/tex] are Arrhenius acids because they form [tex]H^+[/tex]ions in their respective aqueous solution.[tex]HBr(aq)\rightarrow H^++Br^-[/tex][tex]H_2SO_4(aq)\rightarrow 2H^++SO_{4}^{2-}[/tex]Hence, the correct answer is option 4.

(4) HBr i H2SO4...........