1.1. For each of the equations below, complete the table to show the initial and final oxidation numbers of the elements printed in bold, and balance the equation.

i) ...... MnO₄^- + ...... SO₂ + ...... H₂O → ...... Mn²⁺ + ...... SO₄^2- + ...... H⁺

[2]

ii) ...... Cr₂O₇^2- + ...... NO₂ + ...... H⁺ → ...... Cr³⁺ + ...... NO₃^- + ...... H₂O

[2]

1.2. State what is observed during the reaction in (a)(ii).

1.3. Zinc will displace copper from copper(II) sulfate solution.

i) Construct an equation for this reaction. Include state symbols.

[1]

ii) Explain, using oxidation numbers, why this is a redox reaction.

[2]

1.4. Identify the oxidising agent in the reaction in (c)(i). Construct a half-equation to support your answer.