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Question

The lesser covalency of FeCl2 over FeCl3 is due to:

A
lower polarizing power of Fe+2 than that of Fe+3 ion.
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B
lower polarizing power of Fe+3 than that of Fe+2
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C
higher polarizability of Fe+3 than Fe+2
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D
higher polarizability of Fe+2 than Fe+3
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Solution

The correct option is D lower polarizing power of Fe+2 than that of Fe+3 ion.
According to Fajan's rule as size of cation increases it's polarising power decreases and thus covalent character decreases.
Size: Fe+2>Fe+3
Therefore FeCl2 is less covalent than FeCl3

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