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Q.

In the reaction P4+3OH-+3H2O →3H2PO2-+PH3, phosphorus is undergoing

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a

Reduction

b

Hydrolysis

c

Oxidation

d

Disproportionation

answer is C.

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Detailed Solution

  • The oxidation state of elemental phosphorus (P4) is zero. Whereas the  oxidation state of phosphorus in 3H2PO2- is +1 and oxidation state of phosphorus in PH3  is -3. The conversion of oxidation state from 0 to +1 is   oxidation, conversion of oxidation state from 0 to -3 is reduction. The reaction in which both oxidation and reduction takes place is called a disproportionation reaction. 
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