Answer :

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.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

Note : In the folChemistry - Exemplar

Why conductivity Chemistry - Board Papers

(a) Give reChemistry - Board Papers

White phosphorus Chemistry - Exemplar