Question

give reasons for the following

1] Chromium is used for coating.....



2]Iron cans used for storing food items are coated with tin.....

3] We should never handle electrical appliances with wet hands........

4]Bridges and automobiles are either painted or coated with zinc to prevent rusting. Why aren't they electroplated?


Pls answer... Urgently needed

Answer 1

Here's the solution......
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1. Chromium is less reactive and less corroive
for example~ (i)Car bumps
                        (ii) Cycle handles


2.    Iron can are coated with tin, as Tin is less reactive element than Iron, it will prevent or slow down the reaction between the food and Iron

3.  We shall not carry electrical appliances with wet hands because water is a good conductor of electricity which may cause us danger.

4.  Zinc is cheaper and it undergoes preferential sacrificial corrosion, whereas electro-plating costs us a lot.

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