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AP EAMCET201921 Apr 2019Evening ShiftChemistryp Block Elements (Group 15, 16, 17 & 18)Actual

White phosphorus, when heated with conc. NaOH solution in an inert atmosphere of CO 2 , forms phosphine and a sodium salt of oxoacid of phosphorus, ' X ' . The oxidation state of phosphorus in ' X ' is

Options

  1. A+ 3
  2. B+ 4
  3. C+ 1
  4. D+ 5

Correct answer

C. + 1

Step-by-step solution

White phosphorus reacts with conc. NaOH to form phosphine and sodium hypophosphite. P 4   +   3 NaOH   + H 2 O   →   PH 3   +   NaH 2 PO 2 The oxidation state of phosphorus will be : + 1 + 2 + X - 4 = 0 X   = + 1

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