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The p-Block Elements — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThe p-Block Elements1 Mark
MCQ
The hydrides of the first elements in groups $15 - 17$, namely $\ce{NH3​,H2​O}$ and $HF$ respectively, show abnormally high values for melting and boiling points. This is due to:
  • A
    Small size of $N, O$ and $F$
  • ✓
    The ability to form extensive intermolecular $H-$bonding
  • C
    The ability to form extensive intramolecular $H-$bonding
  • D
    Effective van der Waal's interaction
✓

Answer

Correct option: B.
The ability to form extensive intermolecular $H-$bonding
The hydrides of the first elements in groups $15 - 17$, namely $\ce{NH_3​, H_2​O}$ and $HF$ respectively, show abnormally high values for melting and boiling points. This is due to the ability to form extensive inter$-$molecular $H-$bonding. In these hydrides, $H$ atom is attached to highly electronegative $N, O$ or $F$ atoms resulting in stronger hydrogen bonds which lead to molecular associations. Large amount of energy is needed to break these hydrogen bonds.

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