ChemistryEasy86×since 2002Q1003The standard electrode potential (M3+/M2+)\mathrm{(M^{3+}/M^{2+})}(M3+/M2+) for V, Cr, Mn & Co are −-−0.26 V, −-−0.41 V, + 1.57 V and + 1.97 V, respectively. The metal ions which can liberate H2\mathrm{H_2}H2 from a dilute acid are :AMn2+\mathrm{Mn^{2+}}Mn2+ and Co2+\mathrm{Co^{2+}}Co2+BV2+\mathrm{V^{2+}}V2+ and Mn2+\mathrm{Mn^{2+}}Mn2+CV2+\mathrm{V^{2+}}V2+ and Cr2+\mathrm{Cr^{2+}}Cr2+DCr2+\mathrm{Cr^{2+}}Cr2+ and Co2+\mathrm{Co^{2+}}Co2+Check answerSkip