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P Block Elements question

2015 · Q85
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P Block Elements question

2015 · Q85

NEETChemistryP Block ElementsMCQ+4 / −1
The variation of the boiling points of the hydrogen halides is in the order HF > HI > HBr > HCl.

What explains the higher boiling point of hydrogen fluoride?
  1. A
    There is strong hydrogen bonding between HF molecules.
  2. B
    The bond energy of HF molecules is greater than in other hydrogen halides.
  3. C
    The effect of nuclear shielding is much reduced in fluorine which polarises the HF molecule.
  4. D
    The electronegativity of fluorine is much higher than for other elements in the group.
View written solutionFree

Correct answer: A

HF forms strong intermolecular H-bonding due to high electronegativity of F. Hence, the boiling point of HF is exceptionally high. Boiling points of other hydrogen halides gradually increases from HCl to HI due to increase in the size of halogen atoms form Cl to I, which further increases the magnitude of van der Waal's forces.

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