‌E∘Cr2O72−∕Cr3+=1.33VE∘Cl2∕Cl−=1.36V ‌E∘MnO4−∕Mn2+=1.51VE∘Cr3+∕Cr=−0.74V The species which has the most negative value of standard reduction potential will be the strongest reducing agent. Since Cr3+∕Cr has SRP value of −0.74V,Cr is the strongest reducing agent.