Voltammetry Quiz

What is the basic principle of voltammetry?

• Measuring pressure during electrolysis

• Measuring current during electrolysis

• Measuring temperature during electrolysis

• Measuring volume during electrolysis

What type of electrode does polarography use?

• Dropping mercury electrode

• Gold electrode

• Platinum electrode

• Graphite electrode

Which electrode is responsible for controlling the potential in a three-electrode cell?

• Reference electrode

• Working electrode

• Counter electrode

• Auxiliary electrode

What is the purpose of a supporting electrolyte in voltammetry?

• To remove dissolved gases

• To decrease the reaction rate

• To enhance the conductivity of the solution

• To increase the sample size

In cyclic voltammetry, what happens when the potential reaches a predetermined switching potential?

• The current is measured

• The sample is replaced

• The scan reverses direction

• The scan stops

What type of reaction occurs during anodic polarization?

• Precipitation reaction

• Reduction reaction

• Oxidation reaction

• Neutralization reaction

What does cathodic polarization help to prevent?

• Dissolution

• Corrosion

• Oxidation

• Reduction

What is the symbol for anodic polarization?

• ηc

• ηa

• ηr

• ηp

Which type of overpotential is caused by resistance layers on the metal surface?

• Pseudo-Resistance overpotential

• Concentration overpotential

• Activation overpotential

• Resistance or Ohmic overpotential

What does concentration polarization refer to?

• Resistance to electron transfer

• Decrease in pressure

• Limitation by diffusion in the solution

• Increase in temperature