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2 marksRedox Reactions

CAPE Chemistry Unit 1 · 2005 · Paper 1 · Question 2(b)(i)

Sulphur dioxide gas is bubbled through acidified potassium chromate(VI).

Write the balanced ionic equation for the reaction that occurs, given the half-equations: SO₂(g) + 2H₂O(l) → SO₄²⁻(aq) + 2e⁻ + 4H⁺(aq) Cr₂O₇²⁻(aq) + 6e⁻ + 14H⁺ → 2Cr³⁺(aq) + 7H₂O(l)

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  1. 2(a)Referring to Figure 1, explain why the chemical reaction occurring in batteries is described as a redox reaction.[2 marks]
  2. 2(b)(ii)State the change in oxidation number in any ONE identified reagent in the reaction.[2 marks]
  3. 2(c)Select THREE named elements and describe an experiment, including observations, to show how the elements selected can be listed in order of oxidizing or…[4 marks]

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