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p Block Elements

Section: Chemistry

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Question : 42 of 60

Marks: +1, -0

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

[JEE Adv 2012 P2]

redox reaction; −3 and −5.
redox reaction; +3 and +5.
disproportionation reaction; −3 and +1.
disproportionation reaction; −3 and +3.

Solution:

According to the reaction

P_4+NaOH+3H_2O

→

PH_3+3NaH_2PO_2

oxidation state of phosphorus in

P_4

is zero while in

PH_3

it is −3 and in

NaH_2PO_2

, it is +1. This shows that this is a type of disproportionation reaction because there is an increase as well as decrease in the oxidation state of phosphorus.

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