Define hydrogen bond. Is it weaker or stronger than the van der Waals

1.	Define hydrogen bond. Is it weaker or stronger than the van der Waals forces ?
Answer» Hydrogen bond represents strong dipole dipole interactions between the H the highly electronegative atoms (F,0 are N) present in different bonds belonging to either different molecules or some molecule van Waals forces are also dipole forces, consult unit-5 on State of Matter.

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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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Define hydrogen bond. Is it weaker or stronger than the van der Waals forces ?

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