ElectrochemistrySpontaneity of Electrochemical Reactions21Choose the best answerWhich reaction is spontaneous under standard conditions?AZn + Cu²⁺ → Zn²⁺ + CuB2NaCl(l) → 2Na + Cl₂CZn²⁺ + Cu → Zn + Cu²⁺D2Fe(OH)₃ → 2Fe + 3O₂ + 3H₂ Like 0 Discuss 0Share
ElectrochemistryStandard Hydrogen Electrode22Choose the best answerStandard conditions for the hydrogen electrode include:AH₂ at approximately 1 bar pressureBUnit activity of H⁺CTemperature commonly specified as 298 KDAll of these Like 0 Discuss 0Share
ElectrochemistryStandard Hydrogen Electrode23Choose the best answerSHE acts as an anode with Cu but as a cathode with Zn because:AZn has a lower E°red than H⁺/H₂, while Cu has a higher E°redBZn has a higher E°red than CuCCu has a lower E°red than ZnDHydrogen always acts only as an anode Like 0 Discuss 0Share
ElectrochemistryStandard Hydrogen Electrode24Choose the best answerWhen SHE acts as an anode, the half-reaction is:AH₂(g) → 2H⁺(aq) + 2e⁻B2H₂O(l) → 2H₂(g) + O₂(g)C2H⁺(aq) + 2e⁻ → H₂(g)D2H₂O(l) + 2e⁻ → 2OH⁻(aq) + H₂(g) Like 0 Discuss 0Share
ElectrochemistryStandard Hydrogen Electrode25Choose the best answerWhich statement is NOT correct for the standard hydrogen electrode?APlatinum black is used on the Pt electrodeBThe standard temperature is commonly taken as 298 KCA 1 M H₂SO₄ solution is specifically requiredDIt is used as a reference for measuring electrode potentials Like 0 Discuss 0Share