For the following electron-transfer reaction:

Br2(l) + Ni(s) 2Br-(aq) + Ni2+(aq)

Hope you find the answer

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.

A, it is falling action my have a good day