Question

Observing the action of Zn, Fe, Cu and Al metals on the following salt solutions :

a) ZnSO4

(aq)

b) FeSO4

(aq)

c) CuSO4

(aq)

d) Al2

(SO4

)3

(aq)

Arranging Zn, Fe, Cu and Al (metals) in the decreasing order of reactivity based on

the above result.

Answer 1

Hey,

In electrochemical series, the elements with more negative SRP are considered as more reactive.

So, order will be Al>Zn>Fe>Cu.

But,when the aqueous soltions of salts of alkali metals, alkaline earth metals,Al,Zn,Fe,Ni etc, are electrolysed by using inert electrodes, at cathode instead of those metals, H+ ions undergo reduction and produce H2 gas.

Refer to image attached.

HOPE THIS HELPS YOU.

Answer 2

Answer + Explanition

In electrochemical series, the elements with more negative SRP are considered as more reactive.

So, order will be Al>Zn>Fe>Cu.

But,when the aqueous soltions of salts of alkali metals, alkaline earth metals,Al,Zn,Fe,Ni etc, are electrolysed by using inert electrodes, at cathode instead of those metals, H+ ions undergo reduction and produce H2 gas.

Refer to image attached.

Hope This Helps You