Q.Choose the most correct option.
For the following redox reaction, find the correct statement.
Sn²⁺ + 2Fe³⁺ → Sn⁴⁺ + 2Fe²⁺
a. Sn²⁺ is undergoing oxidation
b. Fe³⁺ is undergoing oxidation
c. It is not a redox reaction
d. Both Sn²⁺ and Fe³⁺ are oxidised

Once oxidation number is available, oxidation, reduction, oxidising agent and reducing agent can all be redefined in one single way that works for both ionic and covalent redox reactions, without needing to draw electron-transfer arrows. Oxidation is an increase in an element's oxidation number in a given substance; reduction is a decrease. An oxidising agent is a substance that causes another element's oxidation number to increase while its own key element's oxidation number itself decreases (it is reduced in the process); a reducing agent is a substance that causes another element's oxidation number to decrease while its own key element's oxidation number itself increases (it is oxidised in the process). To identify a redox reaction and name its oxidant/reductant, oxidation numbers are assigned to every atom before and after the reaction, using the standard rules, and whichever element …