Oquizy

Which ionic half-equation shows oxidation?

2H⁺ + 2e⁻ → H₂ Cl₂ + 2e⁻ → 2Cl⁻ Cu²⁺ + 2e⁻ → Cu Zn → Zn²⁺ + 2e⁻

An aqueous solution of sodium chloride is electrolysed using carbon electrodes. When the solution is dilute, gas X forms at the anode. When it is concentrated, gas Y is released instead.What are gases X and Y?

X: Cl₂, Y: O₂ X: H₂, Y: Cl₂ X: O₂, Y: Cl₂ X: O₂, Y: H₂

What is oxidation in terms of electron transfer?

Gain of electrons Gain of protons Loss of electrons Loss of neutrons

In the electrolysis of aqueous copper(II) sulfate with carbon electrodes, which are the products?

Cu at both electrodes Cu at cathode, H₂ at anode Cu at cathode, O₂ at anode H₂ at cathode, O₂ at anode

John tries electroplating. He uses a copper spoon as the cathode, and a pure copper rod as the anode in copper(II) sulfate solution. After 30 minutes, the mass of the spoon increases by 2.4 g. What happens at the anode?

Anode dissolves completely Mass decreases by 2.4 g Mass increases by 2.4 g No change in mass

What is the oxidation state of sulfur in H₂SO₄?

+2 +4 +6 -2

Quiz: Chemistry - Redox Chemistry