AQA AS Jun 2016 Paper 1 Q8

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16A student oxidised a solution of hydrochloric acid with a few drops of sodium chlorate(l) solution. The reaction mixture effervesced and turned pale green. The gas formed bleached universal indicator paper. . 1 Write a half-equation for the oxidation of chloride ions. [1 mark] conditions. . 2 Write a half-equation for the reduction of chlorate(l) ions to chlorine in acidic [1 mark] hydrochloric acid. . 3 Write an overall equation for the redox reaction of chlorate(I) ions with [1 mark] . 4 A solution of sodium chlorate(l) was added to a colourless solution of potassium iodide. Suggest what is observed. Explain the reaction that leads to this observation. [3 marks] 0 8 0 8 0 8 0 8 *16* M/JUN16/7404/1<br />

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