Q71 / 160 · JIPMER 2013 · Chemistry

Which of the following is the increasing order of enthalpy of vaporization?

A
$\mathrm{NH}_3, \mathrm{PH}_3, \mathrm{AsH}_3$
B
$\mathrm{AsH}_3, \mathrm{PH}_3, \mathrm{NH}_3$
C
$\mathrm{NH}_3, \mathrm{AsH}_3, \mathrm{PH}_3$
Correct answer
D
$\mathrm{PH}_3, \mathrm{AsH}_3, \mathrm{NH}_3$

Solution

The inter-particle forces are strongest in $\mathrm{NH}_3$ (Hydrogen bonds). In $\mathrm{PH}_3$ and $\mathrm{AsH}_3$ the inter-particle forces are dipole-dipole forces which are relatively stronger in $\mathrm{AsH}_3$. So the increasing order of vaporization is $\mathrm{PH}_3, \mathrm{AsH}_3$, and $\mathrm{NH}_3$

Hence, the correct answer is option: 'D'.

Which of the following is the increasing order of enthalpy of vaporization?

Solution

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