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What is menal by (a) displacement reacti...

What is menal by (a) displacement reactinon, and (b) double displacement reaction ? Example with the help of one example each.

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Displacement reaction is a chemical reaction in which a more reactive element displaces a less reactive element from its compound. Both metals and non-metals take part in displacement reactions. For example, reaction of iron nails with copper sulphate solution.
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What is meant by a displacement reaction ?

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