Question:

Boiling points of the hydrogen halides

Updated On: Jul 6, 2022
  • Increases regularly in order of relativemolecular mass
  • Decreases sharply from HF to HCl and then increases
  • Decreases regularly in order of relative molecular mass
  • Increases sharply from HF to HCl and then decreases regularly with increase of relative molecular mass
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The Correct Option is B

Solution and Explanation

The increasing order of boiling point is HCl < HBr < HI < HF Boiling point increases with increase in atomic weight of halogen due to increase in the van der Waals' forces. However, boiling point of HF is highest due to presence of hydrogen bonding.
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Concepts Used:

P-Block Elements

  • P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
  • P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.

P block elements consist of: