Question 9

The reaction between dichromate ions (Cr2O7-2) and iron(II) ions (Fe2+) in an acidic medium is given below.

9.1 Determine the oxidation number of CHROMIUM in Cr2O7-2(aq).(2)

9.2 Define reduction in terms of electron transfer.(2)

9.3 Write down the FORMULA of the substance that undergoes oxidation. Explain
the answer in terms of oxidation numbers.(2)

9.4 Write down the FORMULA of the oxidising agent.(2)

9.5 Write down the reduction half-reaction.(2)

9.6 Write down the net balanced ionic equation for the reaction, using the
ion-electron method.(3)


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