Q27 / 160 · AP EAMCET 2019 (21 Apr Shift 2) · Chemistry

White phosphorus, when heated with conc. NaOH solution in an inert atmosphere of CO2, forms phosphine and a sodium salt of oxoacid of phosphorus, 'X'. The oxidation state of phosphorus in 'X' is

  • A
    +3
  • B
    +4
  • Correct answer
    C
    +1
  • D
    +5

Solution

White phosphorus reacts with conc. NaOH to form phosphine and sodium hypophosphite.

P4 + 3NaOH +H2O → PH3 + NaH2PO2

The oxidation state of phosphorus will be :

 +1+2+X-4=0X =+1

Hence, the correct answer is option: 'C'.

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