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Multi-Electron Configurations and Orbital Diagrams

The lesser co...

Question

The lesser covalency of $F e C l_{2}$ over $F e C l_{3}$ is due to:

lower polarizing power of

F e^{+ 2}

than that of

F e^{+ 3}

ion.

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lower polarizing power of

F e^{+ 3}

than that of

F e^{+ 2}

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higher polarizability of

F e^{+ 3}

than

F e^{+ 2}

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higher polarizability of

F e^{+ 2}

than

F e^{+ 3}

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Solution

The correct option is D lower polarizing power of $F e^{+ 2}$ than that of $F e^{+ 3}$ ion.
According to Fajan's rule as size of cation increases it's polarising power decreases and thus covalent character decreases.
Size: $F e^{+ 2} > F e^{+ 3}$
Therefore $F e C l_{2}$ is less covalent than $F e C l_{3}$

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