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COMEDK Electrochemistry — practice questions — page 2

Explore 76 free Electrochemistry questions in COMEDK Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Electrochemistry questions and exercises with answers

Showing questions 31–60 of 76.

Electrochemistry deals with:Read the answer and worked solution →In a galvanic (voltaic) cell, oxidation occurs at:Read the answer and worked solution →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 →Split the two kinds of cellRead the answer and worked solution →Galvanic cell or electrolytic cell?Read the answer and worked solution →Complete the standard cell potential relationRead the answer and worked solution →Order these electrodes by standard potential, lowest firstRead the answer and worked solution →Match each electrode to the potential your syllabus givesRead the answer and worked solution →True or false: conductivity on dilutionRead the answer and worked solution →Strong electrolyte or weak electrolyte?Read the answer and worked solution →Kohlrausch's lawRead the answer and worked solution →Match each relation to what it linksRead the answer and worked solution →True or false: cells and electrodesRead the answer and worked solution →

Worked practice questions

Electrochemistry deals with:

  1. Mechanical motion
  2. Magnetism
  3. Heat
  4. Relation between chemical reactions and electrical energy
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Correct answer: D. Relation between chemical reactions and electrical energy

Electrochemistry studies the interconversion of chemical and electrical energy: galvanic cells (chemical → electrical), electrolytic cells (electrical → chemical).

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In a galvanic (voltaic) cell, oxidation occurs at:

  1. Wire
  2. Salt bridge
  3. Anode (negative electrode)
  4. Cathode
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Correct answer: C. Anode (negative electrode)

In a galvanic cell, anode is where oxidation occurs (loss of electrons), and it is the NEGATIVE terminal. Cathode is positive, where reduction occurs. **Mnemonic:** 'AN OX' (Anode OXidation) and 'RED CAT' (REDuction CAThode).

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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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More Chemistry topics

Chemical EquilibriumCoordination CompoundsElectrochemical SeriesIdeal and Non-Ideal SolutionsIdeal SolutionsNon-Ideal SolutionsReactions in Aqueous SolutionEquilibrium