Quiz for Electrochemistry

Q1: What is the unit of electric current?

A. Ampere B. Volt C. Ohm D. Watt

Q2: In an electrochemical cell, oxidation occurs at the:

A. Anode B. Cathode C. Electrolyte D. Salt bridge

Q3: Which electrode is positively charged in a galvanic cell?

A. Cathode B. Anode C. Both D. None

Q4: The standard hydrogen electrode (SHE) has a potential of:

A. 0 V B. 1.0 V C. 0.5 V D. -0.5 V

Q5: The flow of electrons in an external circuit is from:

A. Anode to Cathode B. Cathode to Anode C. Electrolyte to Salt Bridge D. Salt Bridge to Electrolyte

Q6: In electrolysis, the electrode where reduction occurs is called:

A. Cathode B. Anode C. Salt bridge D. Electrolyte

Q7: Faraday’s first law states that:

A. Mass of substance is proportional to charge passed B. Charge is proportional to time C. Current is proportional to voltage D. Mass is proportional to current

Q8: What is the charge on one mole of electrons (Faraday constant)?

A. 96500 C B. 1.6 × 10⁻¹⁹ C C. 96485 C D. 1.0 × 10⁻⁶ C

Q9: Which metal is used as the standard electrode in SHE?

A. Platinum B. Copper C. Zinc D. Silver

Q10: In a Daniell cell, the electrolyte used at the cathode is:

A. CuSO4 B. ZnSO4 C. H2SO4 D. NaCl

Q11: Which electrode gets oxidized in a Zn-Cu galvanic cell?

A. Zn electrode B. Cu electrode C. Both D. None

Q12: The emf of a galvanic cell is:

A. Difference between cathode and anode potential B. Sum of cathode and anode potential C. Product of potentials D. None

Q13: The electrode potential depends on:

A. Concentration of ions B. Temperature C. Nature of electrode D. All of the above

Q14: Which of the following is a redox reaction?

A. Zn + Cu²⁺ → Zn²⁺ + Cu B. HCl + NaOH → NaCl + H₂O C. AgNO₃ + NaCl → AgCl + NaNO₃ D. BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl

Q15: In electrolysis of molten NaCl, the products are:

A. Na and Cl₂ B. NaCl and Na C. NaOH and H₂ D. Na₂ and Cl

Q16: Electroplating involves:

A. Deposition of metal on cathode B. Deposition of metal on anode C. Oxidation at cathode D. Reduction at anode

Q17: The Nernst equation relates:

A. Cell potential and ion concentration B. Current and voltage C. Resistance and voltage D. Charge and mass

Q18: Which one is the strongest oxidizing agent?

A. F₂ B. Cl₂ C. Br₂ D. I₂

Q19: Electrochemical cells convert:

A. Chemical energy to electrical energy B. Electrical energy to chemical energy C. Heat to electrical energy D. Mechanical energy to chemical energy

Q20: Which is the correct sequence of standard electrode potentials (most positive to least)?

A. F₂ > Cl₂ > Br₂ > I₂ B. I₂ > Br₂ > Cl₂ > F₂ C. Cl₂ > F₂ > Br₂ > I₂ D. Br₂ > I₂ > Cl₂ > F₂