ThermochemistryHard

Question

Which of the following is arranged in the increasing order of enthalpy of vaporisation ?

Options

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

Solution

The order of heat of vaporisation or boiling point of the hydrides of VA group theirmolecular weight. Anomalous behaviour of NH3 is due to H-bonding present in NH3
Thus the correct order is NH3 > AsH3 > PH3

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