Question

Q1) Define a) corrosion b) electrode potential c) electrochemical cell d) wavelength e) electroplating

Answer 1

 a) corrosion

Destruction or deterioration or disintegration of a metal by chemical or electrochemical reaction with its environment is called corrosion.

b) electrode potential

A Galvanic cell is made up of two electrodes. One is anode(-) and other is Cathode(+). In each half cell,a metal electrode dips into a solution. A potential difference between metal and solution is present at the surface of separation of metal and solution. This potential difference is called electrode potential.

c) electrochemical cell

In electrochemical cell, electrochemical reactions are studied. In this cell, two electronic conductors dip into an electrolyte. The electronic conductor is metal or carbon rod. The electrolyte is in the form of pure liquid or aqueous solution. The electrochemical reactions are redox reactions and involve electron transfer from one species to other. At one electrode, oxidation occurs and at other electrode, reduction occurs. The sum of these oxidation and reduction half reactions is the net cell reaction.

 

d) wavelength

 

e) electroplating

Electroplating is basically the process of plating a metal onto the other by hydrolysis mostly to prevent corrosion of metal or for decorative purposes. The process uses an electric current to reduce dissolved metal cations to develop a lean coherent metal coating on the electrode.