Question:
Which one has the lowest boiling point?
Which one has the lowest boiling point?
Updated On: Apr 27, 2024
- $NH_3$
- $PH_3$
- $AsCI_3$
- $SbH_3$
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The Correct Option is B
Solution and Explanation
In the hydrides of group number five, the boiling
points changes as
$_{238.5K}^{ \, \, NH_3 \, \, \, >} \, _{185.5 K}^{ \, \, PH_3} \, _{\, \, \, \, 254.6 K}^{ < \, \, AsH_3} \, _{ \, \, \, \, 254.6 K}^{< \, \, SbH_3} \, _{ \, \, \, \, \, \, 290 K}^{< \, \, \, BiH_3}$
$\therefore \, $ Generally mass increases then boiling point increases.
The higher boiling point of $NH_3$ is due to excessive
hydrogen bonding, so $PH_3$ have lowest boiling point
among hydrides of group number 15, i.e. nitrogen
family.
points changes as
$_{238.5K}^{ \, \, NH_3 \, \, \, >} \, _{185.5 K}^{ \, \, PH_3} \, _{\, \, \, \, 254.6 K}^{ < \, \, AsH_3} \, _{ \, \, \, \, 254.6 K}^{< \, \, SbH_3} \, _{ \, \, \, \, \, \, 290 K}^{< \, \, \, BiH_3}$
$\therefore \, $ Generally mass increases then boiling point increases.
The higher boiling point of $NH_3$ is due to excessive
hydrogen bonding, so $PH_3$ have lowest boiling point
among hydrides of group number 15, i.e. nitrogen
family.
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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:
- Group 13 Elements: Boron family
- Group 14 Elements: Carbon family
- Group 15 Elements: Nitrogen family
- Group 16 Elements: Oxygen family
- Group 17 Elements: Fluorine family
- Group 18 Elements: Neon family