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Question

The increasing order of enthalpy of vaporization of NH3, PH3, and AsH3 is


A

NH3, AsH3, PH3

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B

AsH3, PH3, NH3

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C

NH3, PH3, AsH3

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D

PH3, AsH3, NH3

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Solution

The correct option is D

PH3, AsH3, NH3


The inter-particle forces are strongest in NH3 (Hydrogen bonds). In PH3 and AsH3 the inter-particle forces are dipole-dipole forces which are relatively stronger in AsH3. So the increasing order of vaporization is PH3, AsH3, and NH3 .


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