1. The equation for the reaction between zinc and aqueous copper(II) sulfate is shown. Zn + Cuso, → ZnSO, + Cu

Which statement is correct?

a. The oxidation state of the oxidising agent has changed from 0 to +2.

b. The oxidation state of the reducing agent has changed from 0 to +2.

c. The oxidation state of the reducing agent has changed from +2 to 0

d. This is not a redox reaction. The solution changes from colourless to blue.

2. Complete these half-equations. Balance the charges by adding electrons. State whether oxidation or reduction has taken place.

1. Pb4+ + 2e—>
2. Br1- —>+
3.O2 +—> O2-

3. When aqueous iron(III) chloride is added to aqueous potassium iodide occurs and iodine is formed.

Which statement is correct?

a. lodide ions are oxidised, they gain electrons in this reaction.

b. Neither iodide ions nor iron (III) chloride is oxidised in this reaction.

c. lodide ions are oxidised, they lose electrons in this reaction.

d. Iron (III) chloride is oxidised in this reaction.