Question

The reaction of white phosphorus with aqueous `NaOH` gives phosphine along with another phosphorus containing compound. The reacation type, the oxidation states of phosphorus in phosphine and the other product are respectvely:
A. redox reaction , -3 and -5
B. redox reaction , +3 and +5
C. disproportionation reaction , -3 and -1
D. disproportionation reaction , -3 and +3

Answer 1

Correct Answer - C
`overset(0)(P)_(4)+3NaOHrarroverset(-3)(PH_(3))+NaH_(2)overset(+1)(PO_(2))`
O.N of P in `P_(4)` decreases from -3 in `PH_(3)` and increases from 0 to -1 in `NaH_(2)PO_(4) :.` It is a disproportionatin reaction.