1) Consider the following cell reaction. 2Fe(s)+O2(g)+4H+(aq)→ 2Fe2+(aq)+2H2O(l), E°=1.67 V At [FE2+]=10−3M, P(O2)=0.1atm and pH=3 , the cell potential at 25° C is A) 1.47 V B) 1.77 V C) 1.87 V D) 1.57 V Answer: Option DExplanation:The half reactions are Fe(s)→Fe2+(aq)+2e−×2 O2(g)+4H++4e−→2H2O+2Fe(s) +O2(g)+4H+→2Fe2+(aq)+2H2O(l) E=E0−0.0594log(10−3)2(10−3)4)(0.1)=1.57V