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Vanadium Compounds and Ions

2018 Paper One

Question Nine
7 mark question.

1. The most common incorrect answer was Zn2+.
3. The structure was often given, incorrectly, as a mirror image and the type of isomerism as optical;
4. Incorrect equations included charged vanadium species.

What is required is a more negative value that is greater than +0.34V - if less than +0.34V then there would be a continued reduction to V3+. The key phrase is 'no further'. The only half-equation that can do this is the oxidation of Fe2+ to Fe3+.



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