Question

to avoid the blue green layer formed in the inner walls of copper and brass containers they are coated with

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Answer 1

Answer:

Because tin is less reactive than brass and copper. So if food like pickles which are acidic is kept in brass or copper vessel it might get contaminated. A coating of tin prevents contamination of the food.

Answer 2

Answer:

Because tin is less reactive than brass and copper. So if food like pickles which are acidic is kept in brass or copper vessel it might get contaminated. A coating of tin prevents contamination of the food