NEET UG · Chemistry

Electrochemistry

18 practice questions, each with the answer and an explanation.

Practise Electrochemistry now

Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 18 questions

  1. What happens when an opposing external potential (Vext) equal to 1.10 V is applied across a standard Daniell cell (Zn | Zn2+(1M) || Cu2+(1M) | Cu)?
  2. Why is an agar-agar gel containing potassium chloride (KCl) or potassium nitrate (KNO3) widely employed inside the salt bridge of a galvanic cell?
  3. Given the standard reduction potentials: E°(Fe3+/Fe2+) = +0.77 V and E°(Sn4+/Sn2+) = +0.15 V, what is the standard electromotive force (E°cell) for the spontaneous redox reaction: 2 Fe3+ + Sn2+ -> 2 F…
  4. Using the Nernst equation at 298 K, what is the cell potential (Ecell) of a Daniell cell: Zn | Zn2+(0.01 M) || Cu2+(1.0 M) | Cu, given E°cell = 1.10 V?
  5. If the standard electromotive force of a galvanic cell (E°cell) is +0.591 V at 298 K for a two-electron transfer process (n = 2), what is the value of the equilibrium constant (Kc) for the cell reacti…
  6. What is the relationship between the standard Gibbs free energy change (ΔG°) and the standard cell potential (E°cell) of an electrochemical cell?
  7. Why does the specific conductivity (κ) of both strong and weak electrolyte solutions decrease upon progressive dilution with water?
  8. If an electrolytic conductivity cell with cell constant 0.5 cm^-1 contains a 0.05 M solution with resistance 100 ohms, what is the molar conductivity (Λm) of the solution?
  9. Which mathematical equation describes the variation of molar conductivity (Λm) with concentration (C) for strong electrolytes in dilute solutions (the Debye-Hückel-Onsager equation)?
  10. According to Kohlrausch's Law of Independent Migration of Ions, how is the limiting molar conductivity of acetic acid (Λm°(CH3COOH)) calculated from the limiting molar conductivities of strong electro…
  11. How many Coulombs of electric charge are required for the complete electrochemical reduction of one mole of dichromate ions (Cr2O72-) to Cr3+ in an acidic aqueous solution?
  12. A steady electric current of 2.0 amperes is passed through a solution of copper(II) sulfate (CuSO4) for exactly 16 minutes and 5 seconds (965 seconds). What mass of copper (atomic mass = 63.5 g/mol) i…
  13. During the industrial electrolysis of concentrated aqueous sodium chloride (brine solution), what are the principal products liberated at the cathode and anode?
  14. Why does a mercury button cell maintain an exceptionally constant electromotive force (approximately 1.35 V) throughout its entire operational lifetime?
  15. What chemical changes occur at the anode and cathode when a secondary lead storage battery is recharged by connecting it to an external direct current power source?
  16. In the hydrogen-oxygen (H2-O2) fuel cell utilized in the Apollo space program, what overall chemical reaction occurs to generate electrical power?
  17. Why does the galvanization of iron (coating with zinc) prevent rusting even if the outer zinc layer is scratched and iron is exposed to the atmosphere?
  18. In which electrochemical condition does the degree of dissociation (α) of a weak electrolyte approach unity (α = 1.0)?

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