In the joining of railway tracks, iron oxide is made to react with

Which one of the following does not form oxide on reaction with oxygen?

Which one of the following is not an oxidation reaction?

Which one among the following is an example of oxidation reaction?

Which one of the following is not an example of an oxidation reaction?

When copper reacts with moist carbon dioxide (CO₂) in air, it forms agreen coating of which one of the following compounds?