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  4. The reaction of white phosphorous with aqueous NaOH gives phosphine along with another phosphorous containing compound. The reaction type; the oxidation states of phosphorus in phosphine and the other product are respectively

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Q. The reaction of white phosphorous with aqueous $NaOH$ gives phosphine along with another phosphorous containing compound. The reaction type; the oxidation states of phosphorus in phosphine and the other product are respectively

AIEEEAIEEE 2012

Solution:

The balanced disproportionation reaction involving white phosphorus with aq. $NaOH$ is

image

*However, as the option involving +1 oxidation state is completely missing, one might consider that $NaH _{2} PO _{2}$ formed has undergone thermal decomposition as shown below:

$2 NaH _{2} PO _{2} \stackrel{\Delta}{\longrightarrow } Na _{2} H P O _{4}+ PH _{3}$

Although heating is nowhere mentioned in the question, the "other product" as per available options seems to be $Na _{2} HPO _{4}$ (oxidation state $=+5$ ).