1. Which of the following statements is not true for cyclic voltametry?
It consists of a three electrode system
The potential is varied between a maximum and a minimum in a cyclic manner with time
It was developed from polarography
None of the above
2. An example of chemically modified electrode is Nafion coated electrodes implanted in the brain to detect dopamine in presence of ascorbate. Given that dopamine is positively charged at physiological pH, how do you think the electrodes work?
Nafion is a cation exchange polymer and selectively transports ascorbate to the electrode where it gets oxidized.
Nafion is a cation exchange polymer and selectively transports dopamine to the electrode where it gets oxidized.
Nafion is a cation exchange polymer and transports ascorbate and dopamine to the electrode where both gets oxidized.
None of the above.
3. If after oxidation a species is unstable then the cyclic voltamogram will be characterized by
A peak in the anodic sweep accompanied by no peak in the cathodic sweep.
A peak in the catodic sweep accompanied by no peak in the anodic sweep.
A peak in the anodic sweep accompanied by a peak in the cathodic sweep.
The species will be electrochemically irresponsive.
4. Slow electron transfer kinetics leads to Decrease in the delta Ep value on increasing the scan rate.
Increase in the delta Ep value on increasing the scan rate.
Increase in ipa or ipc value on increasing the scan rate.
None of the above.
5. In a cyclic voltammetric process the current is measured between
The working electrode and the reference electrode.
The working electrode and the counter electrode.
The counter electrode and the reference electrode.
None of the above.
6. In the cyclic voltammogram of parathione the first cathodic peak corresponds to
4e oxidation of hydroxylamine.
4e reduction of nitro group.
2e oxidation of hydroxylamine.
2e oxidation of nitroso group.
7. The form of voltammetry with very high sensitivity is
Cyclic Voltammetry
Normal Pulse Voltammetry
Differential Pulse Voltammetry Stripping Voltammetry
8. Which of the following forms of electrochemistry seeks to obtain the condition of full polarization?
Potentiometry
Voltammetry
Coulometry
Electrogravimetry
9. Which of the following measurements involves electrolysis?
The measurement of pH with a pH electrode.
A redox titration using a redox indicator.
A stripping analysis of uranium in water.
A titration in which the analyte solution potential is measured as a function of added titrant relative to the standard hydrogen electode.
10. The limiting current in a linear sweep voltammogram is related to
The standard reduction potential for the redox couple under investigation.
The reduction potential of the reference electrode.
The point at which concentration polarization begins.
The concentration of the analyte of interest.