ElectrochemistryOxidation and Reduction21Choose the best answerDuring oxidation, the oxidation number of an element:AIncreasesBDecreasesCAlways becomes zeroDRemains unchanged Like 0 Discuss 0Share
ElectrochemistryOxidation and Reduction22Choose the best answerIn 10Cl⁻ + 16H⁺ + 2MnO₄⁻ → 5Cl₂ + 2Mn²⁺ + 8H₂O, which statement is correct?AMn is oxidized from +7 to +2BCl is reduced from 0 to −1CCl⁻ is reduced from −1 to 0DMn is reduced from +7 to +2 Like 0 Discuss 0Share
ElectrochemistryRules and Exceptions of Oxidation Number23Choose the best answerWhat is the oxidation state of oxygen in KO₂?A−1/2B−2C−1D−3 Like 0 Discuss 0Share
ElectrochemistrySpontaneity of Electrochemical Reactions24Choose 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
ElectrochemistryFuel Cells25Choose the best answerIn hydrogen–oxygen fuel cells used in space applications, the useful by-product obtained is:ANiBPbCH₂ODNaOH Like 0 Discuss 0Share