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The hydrides of first elements in group 15 to 17, namely NH₃, H₂O and HF respectively show abnormally high values for melting and boiling points. This is due to :

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Effective van der Waals’ interaction

The ability to form extensive intramolecular H- bonding

Small size of N, O and F

The ability to form extensive

intermolecular H- bonding

answer is B.

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Detailed Solution

Abnormal melting points due to their ability of forming intermolecular H-bonding.

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