Of the following hydrides which one has the lowest boiling point?
A
AsH3
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B
SbH3
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C
PH3
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D
NH3
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Solution
The correct option is CPH3
NH3>PH3<AsH3<SbH3<BiH3 From PH3 to BiH3the boiling points increase with increase in molecular weights, due to
the increase in Van der Waal's forces with molecular mass.
However, boiling point of NH3>PH3even though NH3 has lower molecular mass thanPH3, due to the intermolecular hydrogen bonding in Ammonia that is not present inPH3 and other hydrides in Group-15.