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                           Test Tube 3  ........................................................................................................................

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                           Test Tube 4  ........................................................................................................................

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                           Test Tube 5  ........................................................................................................................

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                                                                                                   [5 marks]

                            (ii)   Explain the reaction occurring in Test Tubes 1 and 3 to allow for the colour change
                                  in Column 3.

                                  Name of reaction  ...................................................................................................

                                  Explanation  ...........................................................................................................


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                                                                                                   [2 marks]
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