Question
What is meant by electrolysis? Mention its two uses with examples.
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Answer
- When electric current is passed through an aqueous solution or molten ionic compound, the ions of the compound form products on electrodes by electrolytic oxidation-reduction.
- This process is called an electrolysis.
- Uses :
- $(1)$ Gas and metal can be obtained from an aqueous solution of salt.
- For example, Electrolysis of an aqueous solution of $NaCl$ produces $Na$ metal and $Cl_2$ gas.
- $(2)$ The coating (protective layer) of one metal can be formed on the surface of another metal.
- For example, Gold plating can be carried out on the surface of silver articles.
- $Zn$ layer can be formed on the surface of iron.
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