Electrochemistry

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Q1. Which of the following is a primary cell? (2023) 2023

Solution:

The zinc-carbon battery is a type of primary cell, which cannot be recharged.

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Q2. What is the unit of electrical conductivity? (2023)

Solution:

The unit of electrical conductivity is Siemens (S).

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Q3. What is the reduction potential of the half-reaction 2H⁺ + 2e⁻ → H₂?

Solution:

The standard reduction potential for 2H⁺ + 2e⁻ → H₂ is 0.00 V.

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Q4. In a concentration cell, if the concentration of one half-cell is 0.1 M and the other is 1 M, what is the cell potential?

Solution:

Using the Nernst equation, E = (0.0591/n) log([C1/C2]), where n=1.

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Q5. What is the Faraday's constant?

Solution:

Faraday's constant is approximately 96485 C/mol.

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Q6. In electrolysis, the process of oxidation occurs at the: (2023)

Solution:

In electrolysis, oxidation occurs at the anode.

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Q7. In electrolysis, the process of oxidation occurs at the: (2023) 2023

Solution:

In electrolysis, oxidation occurs at the anode.

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Q8. What is the Nernst equation for a cell at 298 K with E° = 0.77 V and [Zn²⁺] = 0.01 M?

Solution:

Using the Nernst equation: E = E° - (0.0591/n) log([Zn²⁺]), where n=2.

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Q9. In a galvanic cell, if the anode reaction is 2Ag⁺ + 2e⁻ → 2Ag, what is the cathode reaction? (2022)

Solution:

The cathode reaction must be a reduction reaction, and Cu²⁺ + 2e⁻ → Cu is a common cathode reaction.

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Q10. What is the standard electrode potential of the half-reaction Zn²⁺ + 2e⁻ → Zn?

Solution:

The standard electrode potential for Zn²⁺/Zn is -0.76 V.