Q43 of 76 Page 271

What is meant by electroplating? What is the purpose of electroplating?

The process of coating of a layer of any metal over other metal is called electroplating.

The purpose of electroplating is to provide the shiny appearance, rust free metal surface etc.


Example - 1. Chromium plating is done on metals body parts of cars, bikes, cycles, etc.


2. Gold and silver plating is done on the artificial jewelry.


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42

State some of the characteristics of chemical changes brought about by the chemical effect of electric current.

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Why does an electric bulb glow when a current passes through it?

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Which properties of chromium metal make it suitable for electroplating it on car bumpers, bath taps and bicycle handlebars, etc., made of iron?

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A strip of impure copper metal is given to you. Describe briefly how you will purify it by using the chemical effect of electric current. Draw a labelled diagram of the experimental set up used for this purpose.