Question

what would be the correct order if Zn, Fe, Al and Cu are arranged in increasin order of reactivity

Answer 1

Reactivity of the atoms of elements are determined by the valency electrons.

Out of the list of elements, cu has both 2 or 3 valency, Fe too has 2 or 3 valency, Zn has 2 valency, Al has 3 valency.

Therefore, the order of reactivity is cu, Fe, Zn, Al.

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Answer 2

cu has both 2 or 3 valency, Fe too has 2 or 3 valency, Zn has 2 valency, Al has 3 valency.

Therefore, the order of reactivity is cu, Fe, Zn, Al.