MCQ
The three important oxidation states of phosphorus are
- ✓$ - 3,\, + 3$ and $ + 5$
- B$ - 3,\, + 3$ and $ - 5$
- C$ - 3,\, + 4$ and $ - 4$
- D$ - 3,\, + 3$ and $ + 4$
$+3$ is due to the participation of only $3 P ^3$ (due to inert pair effect). Only three electrons involve in bond formation.
$+5$ is due to the participation of $3 s ^2 3 P ^3$ (due to absence of inert pair effect). All the five electrons involves in bond formation.
$-3$ is due to gain of three electrons as it has five electrons in valence shell so as to attain octet configaration.
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$(A)$ Upon heating, $H _3 PO _3$ undergoes disproportionation reaction to produce $H _3 PO _4$ and $PH _3$.
$(B)$ While $H _3 PO _3$ can act as reducing agent, $H _3 PO _4$ cannot.
$(C)$ $H _3 PO _3$ is a monobasic acid.
$(D)$ The $H$ atom of $P - H$ bond in $H _3 PO _3$ is not ionizable in water.