(1989, 2 M)
(i) $\mathrm{H} _{3} \mathrm{PO} _{3}$ is a tribasic acid.
(ii) Phosphine has lower boiling point than ammonia.
(i) In $\mathrm{H} _{3} \mathrm{PO} _{3}$, there is only two replaceable $\mathrm{H}$, hence monobasic
(ii) $\mathrm{NH} _{3}$ molecules are associated by intermolecular $\mathrm{H}-$ bonds.
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