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Arrange the following in order of increasing reactivity with suitable explanation :- Cu, Fe, Zn, Ag, Ca, Au

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Arrange the following in order of increasing reactivity with suitable explanation :- 

 Cu, Fe, Zn, Ag, Ca, Au

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Au, Ag, Cu, Fe, Zn, Ca 

This is based on standard reduction potential. From Ca to Au value of E0 cell goes on increasing. Greater the E0 value lesser is the reactivity of a metal.

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