Electrolysis

During the electrolysis of molten sodium chloride what is produced at the cathode?

• Na (s)

• Cl (g)

• Cl_{2 (g)}

• Na (l)

Which is the correct half equation for the anode during the electrolysis of molten lead bromide?

• Pb²⁺ + 2e^- --> Pb _(l)

• 2Br ^- + 2e ^- --> Br_{2 (g)}

• Pb²⁺ --> Pb _(l) + 2e^-

• 2Br ^- --> Br_{2 (g)} + 2e ^-

Electrolysis of which does not give Cl_2(g) at the anode?

• concentrated NaCl_(aq)

• NaCl (l)

• dilute NaCl_(aq)

• PbCl₂ (l)

Which determines what is discharged at an electrode?

• the relative E^o values of the ions

• the concentration of the ions in the electrolyte

• the nature of the electrode

• all of the above

During the electrolysis of CuSO_4(aq) with inert electrodes

• Cu(s) is formed at the cathode and the solution stays blue

• Cu(s) is formed at the anode and the solution becomes paler

• Oxygen is formed at the anode and the solution stays blue

• Oxygen is formed at the anode and the solution becomes paler

During the electrolysis of CuSO_4(aq) with copper electrodes

• the cathode increases in mass

• the cathode decreases in mass

• the anode increases in mass

• the solution becomes paler

1 Faraday is:

• The charge carried by I mole of electrons

• 96,500 C

• required to turn 1 mole of sodium ions into sodium atoms

• all of the above

what is common about the electrolysis of NaOH_(aq), H₂SO4_(aq) and dilute NaCl_(aq)

• hydrogen gas is produced at the cathode

• chlorine gas is produced at the anode

• sodium is produced at the cathode

• they have nothing in common

Which produced the most amount of metal at the cathode

• CuCl electrolysed for 3 mins with 2.0 A

• CuCl₂ electrolysed for 3 mins with 2.0 A

• CuCl electrolysed for 2 mins with 2.5 A

• CuCl₂ electrolysed for 2 mins with 2.5 A

During silver plating of an object which is true?

• The object to be plated is the cathode

• The object to be plated is the anode

• The electrolyte is copper sulphate

• The cathode must be made of silver