State the reason why zinc is used in dry cells and cosmetics?

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Solution

Zinc is a medium reactive metal and is oxidized slowly by air.It is electropositive as compared to carbon which is used as positive electrode in dry cell.So, it donates electrons and a current is produced.
It is not very reactive and is consumed slowly, so it is used in dry cells.

Zinc and its salts are used in cosmetics due to their astringent and anti-bacterial properties.Zinc, itself offers protection against ultraviolet rays and thus is often an ingredient in cosmetics.

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(a) galvanisation, (b) dry cells, (c) cosmetics?

State the reason why zinc is used in the galvanisation of iron and not copper.

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