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JEE Advanced Unit 9B1: Electrochemical Cells and Standard Potentials — practice questions — page 2

Explore 48 free Unit 9B1: Electrochemical Cells and Standard Potentials questions in JEE Advanced Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 9B1: Electrochemical Cells and Standard Potentials questions and exercises with answers

Showing questions 31–48 of 48.

Standard electrode potential of standard hydrogen electrode (SHE) is:Read the answer and worked solution →In Daniell cell (Zn | Zn²⁺ || Cu²⁺ | Cu), electron flow in external circuit:Read the answer and worked solution →Faraday's first law of electrolysis: amount of substance liberated at electrode is proportional to:Read the answer and worked solution →Conductance is the:Read the answer and worked solution →Nernst equation for cell potential (at 25°C):Read the answer and worked solution →For Daniell cell, cell reaction Zn + Cu²⁺ → Zn²⁺ + Cu. Cell EMF:Read the answer and worked solution →Faraday constant F is:Read the answer and worked solution →Standard Gibbs free energy and cell EMF relation:Read the answer and worked solution →Relation between equilibrium constant K and E°:Read the answer and worked solution →How many coulombs are needed to deposit 1 mole of Cu from CuSO₄ (Cu²⁺ + 2e⁻ → Cu)?Read the answer and worked solution →Time to deposit 1.27 g of Cu from CuSO₄ solution at 2 A current (Cu atomic mass = 63.5):Read the answer and worked solution →Equilibrium constant for cell with E° = 0.118 V, n = 2, at 25°C:Read the answer and worked solution →Specific conductance κ has units:Read the answer and worked solution →Hydrogen-Oxygen fuel cell produces:Read the answer and worked solution →Lead acid battery (used in cars) overall reaction:Read the answer and worked solution →Standard reduction potential ranking. Which is the strongest oxidizing agent?Read the answer and worked solution →Resistance of a conductivity cell filled with 0.1 M KCl is 100 Ω. Specific conductivity κ of solution (cell constant = 1.5 cm⁻¹):Read the answer and worked solution →For a cell reaction reversed in direction, E° becomes:Read the answer and worked solution →

Worked practice questions

Standard electrode potential of standard hydrogen electrode (SHE) is:

  1. -1 V
  2. 0.5 V
  3. 0 V (by convention, reference)
  4. +1 V
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Correct answer: C. 0 V (by convention, reference)

**SHE:** 2H⁺(1 M) + 2e⁻ → H₂(1 atm) is assigned E° = 0 V by convention. All other standard reduction potentials measured relative to SHE.

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In Daniell cell (Zn | Zn²⁺ || Cu²⁺ | Cu), electron flow in external circuit:

  1. No flow
  2. Zn → Cu (anode to cathode externally)
  3. Both directions
  4. Cu → Zn
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Correct answer: B. Zn → Cu (anode to cathode externally)

In Daniell cell, electrons flow from Zn (anode, oxidized) to Cu (cathode, reduced) through external circuit. Conventional current flows from Cu to Zn. EMF ≈ 1.1 V at standard conditions.

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Faraday's first law of electrolysis: amount of substance liberated at electrode is proportional to:

  1. Volume
  2. Voltage
  3. Charge passed (Q = I × t)
  4. Time only
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Correct answer: C. Charge passed (Q = I × t)

m = (Q × M)/(n × F) where Q = It is charge, M = molar mass, n = electrons per ion, F = 96500 C/mol. Mass deposited is directly proportional to charge.

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