Virtual Labs

Heavy metal analysis using Differential Pulse Voltammetry (DPV) and Square Wave Voltammetry (SWV) Techniques.

Q1. Which of the following statement is incorrect about Square wave voltammetry?

a: Direct detection limits as low as 10^–3 M are possible. Explanation

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b: The net current, i_net , is obtained by taking the difference between the forward and reverse current. Explanation

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c: It shows excellent sensitivity and the rejection of background current. Explanation

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d: In this technique, the peak height is directly proportional to the concentration of the electroactive species Explanation

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Q2. Which of the following electrode has a wide potential window, excellent electrochemical stability, and selectivity?

a: Boron-doped diamond electrode Explanation

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b: Glassy carbon electrode Explanation

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c: Platinum electrode Explanation

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d: Silver/silver chloride electrode Explanation

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Q3. _______________ is an electronic device that maintains the potential of a working electrode at a constant level.

a: Amperostat Explanation

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b: Potentiostat Explanation

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c: Galvanostat Explanation

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d: Potentiometer Explanation

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Q4. Boron doped diamond electrode is used as a _________________.

a: Auxiliary electrode. Explanation

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b: Working electrode. Explanation

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c: Reference electrode. Explanation

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d: Conducting electrode. Explanation

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Q5. Reduction reaction produces ___________ current.

a: Controlled Explanation

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b: Constant Explanation

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c: Cathodic Explanation

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d: Anodic Explanation

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Q6. Which of the following is not a characteristic of differential pulse voltammetry?

a: Reversible reactions have asymmetric peaks Explanation

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b: Irreversible reactions have asymmetric peaks Explanation

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c: The peak current is proportional to the concentration Explanation

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d: The detection limit is about 10^-8M Explanation

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Q7. Faraday’s law relates the number of moles of the analyte to the

a: Charge Explanation

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b: Voltage Explanation

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c: Current Explanation

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d: Volume Explanation

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Q8. Which of the following is a disadvantage of boron-doped diamond electrode?

a: Not suitable for commercial applications. Explanation

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b: Low background current Explanation

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c: Good electrical conductivity Explanation

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d: Non-toxic property Explanation

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