Transition metals (A-level only)

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Question 5
Easy

Which of the following reactions does not involve a change in the oxidation state of the transition metal?

2CrO42−+2H+→Cr2O72−+H2O2\text{CrO}_4^{2-} + 2\text{H}^+ \rightarrow \text{Cr}_2\text{O}_7^{2-} + \text{H}_2\text{O}2CrO42−​+2H+→Cr2​O72−​+H2​O

2Fe3++2I−→2Fe2++I22\text{Fe}^{3+} + 2\text{I}^- \rightarrow 2\text{Fe}^{2+} + \text{I}_22Fe3++2I−→2Fe2++I2​

2VO2++Zn+4H+→2VO2++Zn2++2H2O2\text{VO}_2^+ + \text{Zn} + 4\text{H}^+ \rightarrow 2\text{VO}^{2+} + \text{Zn}^{2+} + 2\text{H}_2\text{O}2VO2+​+Zn+4H+→2VO2++Zn2++2H2​O

2MnO4−+5C2O42−+16H+→2Mn2++10CO2+8H2O2\text{MnO}_4^- + 5\text{C}_2\text{O}_4^{2-} + 16\text{H}^+ \rightarrow 2\text{Mn}^{2+} + 10\text{CO}_2 + 8\text{H}_2\text{O}2MnO4−​+5C2​O42−​+16H+→2Mn2++10CO2​+8H2​O

Transition metals (A-level only) Questions

  1. A Level
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