Answer:
A. chromium 3+ ion
Explanation:
The activity series shows that chromium will be oxidized to chromium 3+ ions. This series shows the reactivity of each metal relative to one another.
It is used to predict the activity of metals.
- From the series, chromium like most metal will favor an oxidation reaction;
Cr ⇄ Cr³⁺ + 3e⁻
The more oxidized metals are located at the top of the series.
