Alcohols can be oxidised to carboxylic acids using potassium dichromate as an oxidising agent. Below shows an example of such a redox reaction:

Given that *a* to *f* are positive integers, what is the smallest value of *f*?

**Hint:** Think conservation of charge and conservation of mass.

More in this series of problems for balancing chemical equations: Alcohol redox | TNT | CuSCN-KIO3 system

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