Question

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

Answer 1

Correct Answer - D
`overset(0)P_(4)+3NaOH+3H_(2)Oto3NaH_(2)overset(+1)(PO_(2))+overset(-3)(PH_(3))`
It is a disproportionation reaction. In this reaction, oxidation state of P increases from 0 in `P_(4)" to "+1` in `NaH_(2)PO_(2)` and decreases from 0 in `P_(4)" to "-3" in "PH_(3)`.