The P Block Elements - Result Question 31

####31. Of the following hybrides which one has the lowest boiling point?

[1989]

(a) AsH3

(b) SbH3

(c) PH3

(d) NH3

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Solution:

  1. (c) NH3 undergoes H-bonding and hence has the highest b.p. Among the remaining hydrides i.e. PH3,AsH3 and SbH3 the b.p. increases as the size of the element increases and hence the magnitude of the van der Waal’s forces of attraction increases. Thus, PH3 has the lowest b.p.


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