Question

You are given a bottle of dilute hydrochloric acid and thin strips of the metals copper zinc and iron how will you compare this reactivities can you arrange them in the series in the decreasing order of their reactivity

Answer 1

Zinc and iron displaces hydrogen from the acid whereas copper has no reaction. Among the zinc and iron hydrogen gas is liberated more quikly in the case of zinc than iron. Thus the order is Zn > Fe > Cu.

Answer 2

According to reactivity series

K . |
Na. |
Ca |
Mg |
Al. | decreasing reactivity
Zn |
Fe. |
Sn. |
Pb. |
Cu. |
more the reactivity more the vigorous reaction
so
Zn > Fe > Cu