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Aluminium fluorirde is ionic but aluminium chloride is covalent. Explain |
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Answer» Solution :FIRSTLY, the electronegitivity differencebetween `Al(1.5)` and `Cl(3.0)` is `1.5` whilethat between `Al(1.5)` and `F(4.0)` is `2.5`. As a result, aluminium-fluorine is ionic while that between aluminium-chloride is covalent. Secondly, `Al^(3+)` (53.5 pm) is very small as COMPOUND to `F^(-)` (136 pm) and `Cl^(-)`(181 pm) . Since ACCORDING to Fajan rule, the ssame cation can polarize a biggeranion(i.e., `Cl^(-)`)more easily than a SMALLER anion (i.e,`F^(-)`)therefore, `Cl^(-)`can donate electrons back to `Al^(3+)` more easily than `F^(-)`. In other words, `AlCl_(3)` is covalentwhile `AlF_(3)` isionic. |
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