Aluminium is obtained from aluminium oxide by electrolysis. The ionic half-equation for the process at one of the electrodes is shown below. $\text{Al}^{3+} + 3e^{-} \rightarrow \text{Al}$ Which row states the change in oxidation number of the aluminium and the kind of reaction taking place at this electrode?
- Achange in oxidation number: decrease; type of reaction: reduction
- Bchange in oxidation number: decrease; type of reaction: oxidation
- Cchange in oxidation number: increase; type of reaction: reduction
- Dchange in oxidation number: increase; type of reaction: oxidation