The reaction of white phosphorus 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:
A
redox reaction; −3 and−5
B
redox reaction; +3 and +5
C
disproportionation reaction; −3 and +1
D
disproportionation reaction; −3 and +3
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Solution
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Correct option is C)
Hint: Disproportionation reaction is a reaction in which the same element gets oxidized and gets reduced from one initial oxidation state.
Step 1: Write down the reaction:
P4(white)+NaOH→PH3+NaH2PO2
Step 2: Calculate the oxidation state of phosphorous in the various phosphorous compounds: