An organic compound containing phosphorus on oxidation with $Na_2O_2$ gives a compound '$X$'. This '$X$' when boiled with $HNO_3$ followed by treatment with ammonium molybdate reagent gives a yellow precipitate '$Y$'. '$X$' and '$Y$' respectively are:

  • A
    $Na_3PO_4, (NH_4)_2MoO_4$
  • B
    $Na_3PO_4, (NH_4)_3PO_4 \cdot 12MoO_3$
  • C
    $H_3PO_4, (NH_4)_2MoO_4$
  • D
    $Na_3PO_4, (NH_4)_2MoO_3$

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