1.

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

Answer»

SOLUTION :(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) `therefore 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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