QUE :WHAT IS FAJAN'S RULE AND HOW IT HELPS TO PREDICT COVALENT CHARACTER OF MOLECULE?

ANS: fajan rule " smaller the size of cation greater the size of anion more is covalent character".

fajan's rule helps in predicting covalent character of molecules.

e.g out of SnCl2 and SnCl4 which is covalent in nature ?

correct ans is   SnCl4

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in SnCl2 Sn is in +2 O.S and  SnCl4 is in +4 so due to smaller size of cation in  SnCl4 it is covalent in nature.