What do you understand by electrochemical series? Discuss the importance of electrochemical series.

Explanation

Elements arranged in the decreasing order of their chemical reactivity in a table is termed as electrochemical series.
Importance of electrochemical series :
(i) To compare the relative oxidising and reducing powers.
(ii) To compare relative activities of metals.
(iii) To calculate the standard EMF of any electrochemical cell (`E^(@)` cell).
(iv) To predict whether a metal reacts with acid to give hydrogen gas.
(v) To predict the spontaneity of a redox reaction.