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in Oxidation-Reduction Reactions by (49.3k points)

What is electro chemical series ? The electrode potential of elements A, B, C and D are + 0. 79, -0. 74, + 1.08 and – 0.31 volts. Arrange them in increasing order of reactivity. To store 1 m HCl, which one aluminum or silver is suitable to use ? (E°Al3+ /Al = – 1.66V and E° Ag / Ag = +0.80V)

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Electro chemical series : The arrangement of elements in order of decreasing reduction potential values is called electro chemical series.

Element Electrode potential (V)
A + 0.79
B -0.74
C +1.08
D -0.31

Increasing order of reactivity of these elements :
C < A < D < B
Least reactive Most reactive
The reactivity of elements depends on value of standard electrode potential more negative the value of standard electrode potential of element, more active will be the element.

Aluminum is suitable to store 1m HCl because its standard electrode potential is more negative than silver.

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