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| 1. |
Aluminium fluorirde is ionic but aluminium chloride is covalent. Explain |
| Answer» <html><body><p></p>Solution :<a href="https://interviewquestions.tuteehub.com/tag/firstly-462152" style="font-weight:bold;" target="_blank" title="Click to know more about FIRSTLY">FIRSTLY</a>, 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. <br/> Secondly, `Al^(3+)` (53.5 pm) is very small as <a href="https://interviewquestions.tuteehub.com/tag/compound-926863" style="font-weight:bold;" target="_blank" title="Click to know more about COMPOUND">COMPOUND</a> to `F^(-)` (136 pm) and `Cl^(-)`(181 pm) . Since <a href="https://interviewquestions.tuteehub.com/tag/according-366619" style="font-weight:bold;" target="_blank" title="Click to know more about ACCORDING">ACCORDING</a> to Fajan rule, the ssame cation can polarize a biggeranion(i.e., `Cl^(-)`)more easily than a <a href="https://interviewquestions.tuteehub.com/tag/smaller-1213327" style="font-weight:bold;" target="_blank" title="Click to know more about SMALLER">SMALLER</a> 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.</body></html> | |