Name: Applications of Electrochemical Series
Uploaded: 2019-07-19
Duration: 29 min 46 s
Description: Electrochemical series helps not only to predict the feasibility of redox reactions, but has other applications too. Find out more applications of the series...

Question

What are Fajans' rules?

Accepted Answer

These are the rules which are used to decide the covalent character of an Ionic Compound. No bond is completely ionic. There is some covalent character involved in an ionic bond. It is primary influenced by polarising power of a cation and polarisability of an anion.

$Two terms are required to define the Fajan Rules: 1 . Polarising Power: It is the ability of a cation to pull the electron cloud of an anion. It is directly proportional to the charge density of a cation, i.e, \frac{Charge}{Radius} ratio . 2 . Polarisabilty of an anion: It is the ability of an anion to allow distortion in its electron cloud. Polarisation is a process in which a symmetric electron cloud is converted into an unsymmetric electron cloud. Postulates: (A) Smaller is the size of cation, larger is the size of an anion, greater is the covalent character of an ionic Bond. (B) Greater is the charge on cation and anion, greater is the covalent charcter of an ionic Bond. (C) Cation having pseudo inert gas configuration is more polarising than cation having inert gas configuration.$

What are Fajans' rules?

Important Questions on General Properties of the Elements

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