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

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 of the following compounds is used in 'black and white' photography?

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

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