Electrochemistry Quiz

What is the standard electrode potential of the Cu2+ / Cu half-cell?

• -0.44 V

• +1.36 V

• -0.76 V

• +0.34 V

Which factor does NOT affect the standard electrode potential?

• Size of the electrode

• Temperature

• Pressure of gaseous species

• Concentration of ions

What is the purpose of a salt bridge in an electrochemical cell?

• To increase the electrode potential

• To maintain electrical neutrality in each half-cell

• To prevent the flow of ions

• To mix the solutions in the half-cells

Which species is the strongest oxidising agent based on the given electrode potentials?

• Cl2 (g)

• Br2 (l)

• Fe3+ (aq)

• I2 (aq)

In which medium is Fe2+ more stable compared to Fe3+?

• Basic medium

• Alkaline medium

• Acidic medium

• Neutral medium

What is the process of converting chemical energy to electrical energy in a galvanic cell?

• Reduction

• Electron flow

• Oxidation

• Conversion

In a galvanic cell, where does oxidation occur?

• Cathode

• External circuit

• Anode

• Salt-bridge

What is the standard cell potential equation?

• Ecell = Ered - Eoxid

• Ecell = Ered + Eoxid

• Ecell = Ered / Eoxid

• Ecell = Ered * Eoxid

What is the main advantage of fuel cells?

• Require high temperature

• Low efficiency

• Pollution free

• High cost

What is the process of discharging in a lead-acid storage battery?

• 2PbSO4 (s) + 2H2O (l) -> Pb (s) + PbO2 (s) + 4H+ (aq) + SO42- (aq)

• PbO2 (s) + 4H+ (aq) + SO42- (aq) + 2e- -> PbSO4 (s) + 2H2O (l)

• Pb (s) + SO42- (aq) -> PbSO4 (s) + 2e-

• PbSO4 (s) + 2H2O (l) -> Pb (s) + PbO2 (s) + 4H+ (aq) + SO42- (aq)