elektrolisis

In an electrolysis cell, what are the charges of the cathode and anode, respectively?

• Positive, Negative

• Negative, Positive

• Negative, Negative

• Positive, Positive

During the electrolysis of molten NaCl, what are the products formed at the cathode and anode, respectively?

• Na(s) and Cl2(g)

• Cl2(g) and Na(s)

• Na+(l) and Cl-(l)

• H2(g) and O2(g)

Which of the following will be reduced at the cathode in an electrolysis cell if the solution contains hydrogen ions (H+)?

• Metal ions from Group IA, IIA, Al, or Mn

• Water (H2O)

• Hydrogen ions (H+)

• Other metal ions (not from Group IA, IIA, Al, or Mn)

If an electrolysis cell uses an inert anode (like Pt, Au, or C) and the electrolyte contains an oxyacid anion (e.g., PO4^3-, NO3^-, SO4^2-), what substance will be oxidized at the anode?

• The inert anode itself

• Halide ions (F-, Cl-, Br-, I-)

• Hydroxide ions (OH-)

• Water (H2O)

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What is the oxidation reaction that occurs at the anode during the electrolysis of NaCl solution with a copper anode?

• 2Cl-(aq) → Cl2(g) + 2e-

• 2H2O(l) → O2(g) + 4H+(aq) + 4e-

• Cu(s) → Cu2+(aq) + 2e-

• Fe(s) → Fe2+(aq) + 2e-

During the electrolysis of Mg(OH)2 solution with an inert carbon electrode, what is the overall cell reaction?

• 2H2O(l) → O2(g) + 2H2(g)

• 4OH-(aq) → 2H2O(l) + O2(g) + 4e-

• Mg2+(aq) + 2e- → Mg(s)

• Mg(OH)2(aq) → Mg(s) + O2(g) + H2(g)

What is the primary outcome of electrolyzing molten CuSO4 using a copper electrode?

• Oxygen gas is produced at the anode.

• Hydrogen gas is formed at the cathode.

• Copper is transferred from the anode to the cathode.

• Sulfate ions are oxidized at the anode.

In the electrolytic purification of a metal, which statement accurately describes the electrodes and electrolyte?

• The anode is made of the impure metal, and the cathode is made of the pure metal.

• The anode is made of the pure metal, and the cathode is made of the impure metal.

• Both anode and cathode are made of the impure metal.

• The electrolyte contains a salt of a different metal than the one being purified.