Virtual Labs

The migrations of particles in the solution are in these three ways, except ______________

a: Diffusion. Explanation

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b: Immigration. Explanation

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c: Migration. Explanation

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d: Convection. Explanation

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Q2. In DPV, the plot is obtained by plotting:

a: Potential difference as a function of current. Explanation

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b: Potential difference as a function of time. Explanation

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c: Current difference as a function of time. Explanation

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d: Current difference as a function of potential. Explanation

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Q3. Which of the following is a disadvantage of dropping the mercury electrode (DME)?

a: Applied voltage produces changes in surface tension and hence a change in drop size. Explanation

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b: Mercury has a high hydrogen overvoltage. Explanation

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c: It provides a smooth, fresh surface for the reaction. Explanation

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d: Mercury forms an amalgam with most metals. Explanation

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Q4. Which of the following statement is true?

a: A reference electrode is not required for a cell used for a voltammetry experiment. Explanation

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b: The diffusion layer is found further away from the surface over time diffusion occurs. Explanation

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c: Migration cannot be prevented through the addition of a supporting electrolyte with high ionic strength. Explanation

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d: Diffusion of ions near the electrode surface reduces the concentration profile near the electrode over time for the analyte that is consumed in the electrochemical reaction. Explanation

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Q5. In voltammetry, the characteristic current response is generated by applying which of the following signal.

a: A variable potential excitation signal. Explanation

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b: A variable current excitation signal. Explanation

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c: A constant potential excitation signal. Explanation

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d: A constant current excitation signal. Explanation

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Q6. The lifetime of a mercury drop of DME during its working should be ___________

a: 1-15 seconds. Explanation

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b: Less than 3 seconds. Explanation

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c: 3-6 seconds. Explanation

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d: More than 30 seconds. Explanation

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Q7. From the following, select the incorrect statement about DPV.

a: The height of the peak current is directly proportional to the analyte concentration. Explanation

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b: The detection limit lies between 10 ^-7 to 10 ^-8 M. Explanation

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c: It increases the sensitivity of voltammetry. Explanation

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d: It decreases the sensitivity of voltammetry. Explanation

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Q8. A half-wave potential is a tool for ____________

a: Identification of electroactive species. Explanation

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b: Study of the half-life of electroactive species. Explanation

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c: Determination of concentration of electroactive species. Explanation

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d: Quantitative analysis. Explanation

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Anodic Stripping Voltammetry