Question

Explain electro-chemical series.

Answer 1

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The electrochemical series consists of a list of metals have been arranged in order of their standard electrode potentials. The standard electrode potentials which has been measured for most elements that form ions in solution. Metals which are higher in the electrochemical series displace metals which are lower in the sequence from solutions of their salts. The electrochemical series The following is a list of the standard potentials:

ELEMENT        ELECTRODE POTENTIAL (VOLTS)

lithium            - 3.04
rubidium        -2.92
potassium      -2.92
calcium          - 2.87
barium            -2.80
sodium            -2.71
hydrogen         +0.00
copper              +0.34
iodine               + 0.54
silver                 + 0.80
gold                   +0.80
mercury             +0.80
iodide                +0.54
bromine             +1.07

A negative value for electrode potential means that the element loses electrons more readily than hydrogen (i.e. it is better reducing agent). A positive value for electrode potential means that the element is a poor reducing agent than hydrogen.

A strong oxidising agent has a large positive potential and a strong reducing agent a large negative potential.

The electrochemical series is extremely useful for predicting the chemical behaviour of an element. An electropositive element will displace a less electropositive element from a solution of its ions (e.g. zinc will displace copper from a copper solution).

The applications of electrochemical series are:

⇒Oxidizing and reducing strengths
⇒Comparisons of reactivities of metals
⇒Calculation of EMF of cells
⇒Prediction of liberation of Hydrogen gas from acids by metals
⇒Predicting the feasibility of a redox reaction
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Answer 2

Answer:

the correct answer is option to use