- A redox reaction involves the transfer of electrons, leading to oxidation and reduction.
- In option (3), there is no change in oxidation states of elements; it is a simple double displacement reaction.
- In other options, electron transfer occurs, qualifying them as redox reactions.
List I | List II | ||
---|---|---|---|
A | Mesozoic Era | I | Lower invertebrates |
B | Proterozoic Era | II | Fish & Amphibia |
C | Cenozoic Era | III | Birds & Reptiles |
D | Paleozoic Era | IV | Mammals |