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AIF 3' is a high melting solid whereas '...

AIF _3' is a high melting solid whereas 'SiF_4' is a gas. Explain why??

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AlF_3. is an ionic solid due to large difference ofelectronegativities of .Al. and .F. whereas .SiF_4. is a covalent compound and hence.there are only weak van der Wal.s forces among their molecules.
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