Which compound is an arrhenius acid?
(1) h2so4 (3) naoh
(2) kcl (4) nh3

According to Arrhenius Theory of acids and bases, an Arrhenius acid produces H+ when dissolved in water.

Among the four options, (1) H2SO4 is the correct one because when it dissolves in water, it liberates H+.

Hope this is helpful~

Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.