The number of $P-O-P$ bridges in the structure of phosphorus pentoxide $(P_4O_{10})$ and phosphorus trioxide $(P_4O_6)$ are respectively:

  • A
    $6, 6$
  • B
    $5, 5$
  • C
    $5, 6$
  • D
    $6, 5$

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$Y$ in the given sequence of reactions is
$P_4 + x NaOH + y H_2O \xrightarrow{CO_2} X + z NaH_2PO_2$
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