Virtual Labs

Heavy metal analysis using Square Wave Voltammetry (SWV) Technique.

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

Explanation

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

Explanation

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

Explanation

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

Explanation

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

a: Boron-doped diamond electrode Explanation

Explanation

b: Glassy carbon electrode Explanation

Explanation

c: Platinum electrode Explanation

Explanation

d: Silver/silver chloride electrode Explanation

Explanation

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

a: Amperostat Explanation

Explanation

b: Potentiostat Explanation

Explanation

c: Galvanostat Explanation

Explanation

d: Potentiometer Explanation

Explanation

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

a: Auxiliary electrode. Explanation

Explanation

b: Working electrode. Explanation

Explanation

c: Reference electrode. Explanation

Explanation

d: Conducting electrode. Explanation

Explanation

Q5. Reduction reaction produces ___________ current.

a: Controlled Explanation

Explanation

b: Constant Explanation

Explanation

c: Cathodic Explanation

Explanation

d: Anodic Explanation

Explanation

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

a: Reversible reactions have asymmetric peaks Explanation

Explanation

b: Irreversible reactions have asymmetric peaks Explanation

Explanation

c: The peak current is proportional to the concentration Explanation

Explanation

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

Explanation

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

a: Charge Explanation

Explanation

b: Voltage Explanation

Explanation

c: Current Explanation

Explanation

d: Volume Explanation

Explanation

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

a: Not suitable for commercial applications. Explanation

Explanation

b: Low background current Explanation

Explanation

c: Good electrical conductivity Explanation

Explanation

d: Non-toxic property Explanation

Explanation