Some articles made of silver, copper and iron get coloured coating over them when they are exposed to air. The colour and chemical name of the substance of coating in each case are and .

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Detailed Solution

Concept- The colour and chemical name of the substance of coating in each case are brown and iron oxide.
When silver is exposed to air, it is noticed that the following reaction occurs:

Here, we can observe that silver receives a coating of white colour. And it is known chemically as silver oxide.
When copper is exposed to air, it is noticed that the following reaction occurs:

Here, we can observe that copper acquires a green coating. Copper oxide is the name given to it chemically.
When iron is exposed to air, it is noticed that the following reaction occurs:

Here, we observe iron that has a brown coating applied on it. Iron Oxide is the name given to it chemically.
Hence, the correct answer is Brown, Iron Oxide.

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