It gives us an idea that which element is more reactive , or simply it is very useful in case of the study of displacement reaction. that which metal can displace other metal from the solution.

K > Na > Ca >Mg > Al > Zn > Fe > Pb > H > Cu > Hg > Ag > Au

From this series we can easily find which one is more reactive and which metal can displace the other metal in a reaction.

Lets take an example

Zn + CuSO4     →   ZnSO4 + Cu

Now see in the series that Zn ( zinc) is more reactive than Cu (copper).

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