11 grade chemistry others> By Fajan’s rules, covalent character incr...
By Fajan’s rules, covalent character increases with increase in size of the anion. Identify the correct order of melting point of calcium halides.A) Ca{ F }_{ 2 }
1 AnswersAccording to Fajan's rules, covalent character increases with an increase in the size of the anion. Larger anions can distort the electron cloud of the cation more effectively, leading to greater covalent character in the bonding.
Considering this, the correct order of melting point for calcium halides would be:
D) CaCl2 > CaF2 > CaBr2 > CaI2
This is because as we move down the halogen group, the size of the halide ion increases: F- < Cl- < Br- < I-. Therefore, the covalent character will increase in the order: CaI2 < CaBr2 < CaCl2 < CaF2. This increase in covalent character will result in weaker ionic bonds, leading to lower melting points.
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