Oquizy

In the electrolysis of molten sodium chloride, what is formed at the cathode?

Chlorine gas Hydrogen gas Sodium ions Sodium metal

What is the oxidation state of sulfur in H₂SO₄?

+2 +4 +6 -2

What happens to the mass of the cathode during copper electroplating?

Decreases Increases Stays the same Turns green

Why is hydrogen gas not always produced at the cathode during electrolysis of aqueous solution?

Hydrogen ions are neutral Hydrogen is heavier than water It depends on the concentration and reactivity Water evaporates quickly

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

Which statement correctly identifies the negative electrode and explains why?

Copper, because it has a more negative electrode potential Copper, because it is less reactive and gains electrons Magnesium, because it forms a protective oxide layer Magnesium, because it has a higher tendency to lose electrons

Quiz: Chemistry - Redox Chemistry