The standard reduction potentials at 298 K for the following half reactions are given against each Zn²⁺ (aq) + 2e⁻ ⇌ Zn(s); – 0.762 Cr³⁺ (aq) + 3e⁻ ⇌ Cr(s); – 0.740 2H⁺ (aq) + 2e⁻ ⇌ H₂(g) ; 0.00 Fe³⁺ (aq) + e⁻ ⇌ Fe²⁺(aq); 0.770 Which is the strongest reducing agent?