using fajans rules for polarization and covalency explain why A) MnO melts at th
ID: 1001183 • Letter: U
Question
using fajans rules for polarization and covalency explain why A) MnO melts at the high temp of 1785 C whereas Mn2O7 melts at 6 C B) aluminum fluoride melts at 1290 C and aluminum iodide melts at 190 C using fajans rules for polarization and covalency explain why A) MnO melts at the high temp of 1785 C whereas Mn2O7 melts at 6 C B) aluminum fluoride melts at 1290 C and aluminum iodide melts at 190 C A) MnO melts at the high temp of 1785 C whereas Mn2O7 melts at 6 C B) aluminum fluoride melts at 1290 C and aluminum iodide melts at 190 CExplanation / Answer
Fajans rule is to predict the nature of bonding either covalent or ionic.
Polarization will increase with increase in charge of both cation and anion, decrease in size of cation and increase in size of anion.
A) in case of MnO the oxidation state of Mn is Mn+2 while in Mn2O7 it is Mn+6 so due to this the size of Mn+6 is less than size of Mn+2 ion the size of anions are equal in both the case (Oxide ion) hence the bonding between Mn^+6 and O-2 will be more covalent. so the melting point of Mn2O7 will be more than MnO.
B) similarly in case of Aluminium, due to smaller size of flouride ion as compared to iodide ion the bonding in AlF3 will be more ionic as compared to AlI3 (covalent) so AlI3 will have low melting point.
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