Question

1. Discuss the terms: Electrolysis and Electroplating.
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Answer 1

electrolysis:- is a technique that uses a direct electric current (DC) to drive an otherwise non-spontaneous chemical reaction. Electrolysis is commercially important as a stage in the separation of elements from naturally occurring sources such as ores using an electrolytic cell.

Perhaps the most familiar example of electrolysis is the decomposition (breakdown) of water into hydrogen and oxygen by means of an electric current. The same process can be used to decompose compounds other than water. Sodium, chlorine, magnesium, and aluminum are four elements produced commercially by electrolysis.

Electroplating:- is the process of plating one metal onto another by hydrolysis, most commonly for decorative purposes or to prevent corrosion of a metal. There are also specific types of electroplating such as copper plating, silver plating, and chromium plating.

Metals commonly used in electroplating include zinc, copper and tin, as well as precious metals such as gold, silver and palladium. Plating can occur with individual metals or in various combinations (alloys) that can provide additional value to the electroplating process.

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Answer 2

The process in which direct electric current (DC) is passed through a substance to effect a chemical change (separating it's constituent s) is called electrolysis.

e.g. Water can be broken down into

hydrogen and oxygen by means of electric current

The process of coating a metal with another thin layer of metal such as zinc , tin , gold, etc. by means of electric current called electroplating.

e.g. Iron Bath taps are coated with chromium .

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