Q. 14.3( 48 Votes )
Why are pentahalides more covalent than trihalides ?
Pentahalides (like MX5) means the compounds in which metal is bonded with five halogen atoms. Thus, the oxidation state of metal here is +5. Similarly, trihalides (like MX3) means the compounds in which metal is bonded with three halogen atoms. Thus, the oxidation state of metal here is +3. Now, as the polarizing power is directly proportional to the charge, the metals with the higher charge will have higher polarizing power.
Now,we all know that according to Fazan's rule more the polarising power, more will be its covalency. Hence, Pentahalides are more covalent than trihalides.
Note: Polarizing power is the ability of a cation to distort an anion.
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