p-Block elementsHard

Question

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

Options

A.NH3, PH3, AsH3
B.AsH3, PH3, NH3
C.NH3, AsH3, PH3
D.PH3, AsH3, NH3

Solution

Enthalpy of vaporization is directly proportional to the strength of inter molecular force of attraction like hydrogen bonding  vander Waal′s force of attraction.
NH3 → H-bonding,
PH3 and ASH3 → Vander walls bond.

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