pBlock ElementsII - Result Question 100
####96. Explain the following
$(1989,2 M)$
(i) $H _3 PO _3$ is a dibasic acid.
(ii) Phosphine has lower boiling point than ammonia.
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Solution:
- (i) In $H _3 PO _3$, there is only two replaceable $H$, hence dibasic
(ii) $NH _3$ molecules are associated by intermolecular $H-$ bonds. 97. (i) $\underset{\begin{array}{c}\text { hypophosphorus } \ \text { acid }\end{array}}{2 H _3 PO _2} \stackrel{\Delta}{\longrightarrow} PH _3+H _3 PO _4$ (Disproportionation)
(ii) $NaClO _3+SO _2 \xrightarrow{10 H^{+}} NaCl+S+5 H _2 O$
