Why `AlF_(3)` is a high melting solid wheareas `SIF_(4)` is a gas ?

1.	Why `AlF_(3)` is a high melting solid wheareas `SIF_(4)` is a gas ?
Answer» `AIF_(3)` is an ionic solid due to large differnce in electronegtivies of Al and F whereas `SiF_(4)` is a covalent compound and hence there are only weak van der Walls forces among their molecules .

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Statement-1 : `NH_(3)` is pyramidal in shape . Statement-2 : `SiCl_(4)` and `GaCl_(4)^(-)` are isostructural . Statement-3 : `sd^(3)` hybridisation may be possibleA. TTFB. TTTC. FTTD. TFT
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The crystal lattice of electro covalent compounds is composed ofA. AtomsB. MoleculesC. Oppositely charged ionsD. Both molecules and ions
Statement 1 : All molecules with polar bonds may not have dipole moments Statement 2 : Dipole moment is a vectot quantity and bond dipoles may cancel out.A. Statemetn-1 is true, Statrment-2 is also true, Statement -2 is the correct explanation of statement-1B. Statement -1 is true , Statement 2 is also true, Statement-2 is not the correct ezplanation of Statement-1C. Statement-1 is true, Statement-2 is false.D. Statement-1 is false, Statement-2 is true.
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Why `AlF_(3)` is a high melting solid wheareas `SIF_(4)` is a gas ?

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