Electrolysis Quiz I

For electrolysis of Zinc Chloride, which product will be formed at -ve electrode?

• Zn (II) ions

• Zn metal

• Chloride ions

• Chlorine gas

Which does it mean by anode?

• oxidation occurs.

• reduction occurs.

• both oxidation or reduction occur.

• either oxidation or reduction occurs

What is the expected observation at positive pole?

• nothing happens

• colorless gas is evolved

• yellowish green gas is evolved

• silvery grey solid is deposited.

What ions are present in this solution?

• Na⁺, Cl^-,

• H⁺, OH^-

• Na⁺, H⁺, OH^-, SO₄^2-

• Na⁺, Cl^-, H⁺, OH^-

What ion is preferentially discharge at positive electrode?

• Na⁺

• H⁺

• OH^-

• Cl^-

For the ion which is preferentially discharged at positive electrode, it is due to what factor?

• position at the electrochemical series

• concentration factor

• position in the reactivity series

• all factors mentioned above

What is the correct half equation at the positive electrode?

• 2e- + 2H⁺ → H₂

• 4OH^- → O₂ + 2H₂O + 4e^-

• 2Cl^- → Cl₂ + 2e^-

• e- + Na⁺ → Na

What are the possible products for the electrolysis of brine?

• Na, NaOH, Cl₂

• H_2, NaOH, O₂

• H_2, Cl₂

• H_2, NaOH, Cl₂

Which ion(s) will be attracted to the positive pole?

• H⁺

• OH^-, SO₄^2-

• OH^-

• SO₄^2-

What is the expected observation at the positive pole?

• colorless bubbles given out

• gas smell like SO₂ is given out

• colorless bubbles given out which can give a 'pop' sound

• colorless bubbles given out that can relights a glowing splint