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Give reason for the higher melting point...

Give reason for the higher melting point value of `AlF_(3)` (solid) than `SiF_(4)` (gas).

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(i) `AlF_(3)` is an ionic compound and `SiF_(4)` is a covalent compound.
(ii) Usually covalent compounds exhibit lower melting and boiling points.
(iii) `:. AlF_(3)` bring ionic in nature has strong coulombic force of attraction between the oppositely charged ions, Thereby posses higher melting point.
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