Quiz for Electrolysis

Q1: What is the product at the cathode during electrolysis of molten NaCl?

A. Chlorine gas B. Sodium metal C. Hydrogen gas D. Oxygen gas

Q2: Which electrode reaction occurs at the anode in electrolysis of aqueous CuSO4 using copper electrodes?

A. Cu → Cu²⁺ + 2e⁻ B. Cu²⁺ + 2e⁻ → Cu C. H₂O → ½O₂ + 2H⁺ + 2e⁻ D. SO₄²⁻ → SO₂ + O₂

Q3: Faraday’s first law of electrolysis is related to:

A. Current only B. Time only C. Amount of substance deposited D. Resistance

Q4: Electrochemical equivalent is defined as:

A. Mass deposited per mole B. Charge required to deposit 1g C. Mass deposited per unit charge D. Molar mass of substance

Q5: Which of the following undergoes electrolysis without electrodes being consumed?

A. Electrolysis of CuSO₄ with Cu electrodes B. Electrolysis of NaCl with graphite electrodes C. Electrolysis of molten NaCl with platinum electrodes D. Electrolysis of water with carbon electrodes

Q6: In electrolysis of water, volume ratio of H₂ and O₂ produced is:

A. 2:1 B. 1:1 C. 1:2 D. 3:1

Q7: During electrolysis of dilute H₂SO₄, gas at the cathode is:

A. Oxygen B. Hydrogen C. Chlorine D. Carbon dioxide

Q8: What is Faraday’s constant?

A. 96500 C/mol B. 1 C/mol C. 1.6 × 10⁻¹⁹ C D. 6.022 × 10²³ C/mol

Q9: The unit of electrochemical equivalent is:

A. mol/C B. g/C C. C/mol D. g/mol

Q10: Electrolysis of brine gives:

A. NaOH, Cl₂, H₂ B. NaCl, Cl₂, O₂ C. Na, Cl₂, H₂ D. NaOH, O₂, H₂

Q11: Cathode reaction in molten MgCl₂ electrolysis is:

A. Mg → Mg²⁺ + 2e⁻ B. Mg²⁺ + 2e⁻ → Mg C. Cl⁻ → Cl₂ + e⁻ D. Cl₂ + 2e⁻ → 2Cl⁻

Q12: Which law determines the total charge passed in electrolysis?

A. Ohm’s law B. Faraday’s second law C. Faraday’s first law D. Kirchhoff’s law

Q13: If 1 mole of electrons is passed, how many grams of Ag are deposited?

A. 107.9 g B. 53.9 g C. 1 g D. 10.79 g

Q14: Electrolysis of aqueous NaCl yields:

A. H₂, Cl₂, NaOH B. Na, H₂, O₂ C. H₂, NaOH, Na D. Cl₂, Na, NaOH

Q15: 1 Faraday deposits how many grams of Cu?

A. 31.75 g B. 63.5 g C. 1 g D. 0.5 g

Q16: In electrolysis, ions move:

A. Randomly B. From high to low pressure C. Toward respective electrodes D. Toward middle of cell

Q17: Which is not a product in brine electrolysis?

A. NaOH B. Cl₂ C. H₂ D. Na₂CO₃

Q18: Which metal can’t be refined by electrolysis?

A. Al B. Ag C. Fe D. Na

Q19: Electrolysis of molten PbBr₂ gives:

A. Pb at cathode, Br₂ at anode B. Pb at anode, Br₂ at cathode C. PbBr₂ gas D. PbO at cathode

Q20: In electrolysis, amount deposited is proportional to:

A. Current × Time B. Current² C. Time² D. Resistance