Which of the following phosphorus oxyacids can act as a reducing agent?

  • A
    $H_{3}PO_{3}$
  • B
    $H_{3}PO_{4}$
  • C
    $H_{2}P_{2}O_{6}$
  • D
    $H_{4}P_{2}O_{7}$

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$PCl_5$ exists but $NCl_5$ does not because:

$NaH_2PO_4$ $\xrightarrow{230^\circ C}$ $Na_3P_3O_9$ $\xrightarrow{638^\circ C}$ $(NaPO_3)_n$ $\rightarrow D$ (glossy solid).
Compound $D$ is sodium hexametaphosphate,which is known as:

State the electronic configuration of group-$15$ elements.

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Which of the following elements forms a strongly acidic oxide?

Which of the following acids exists in a polymeric form?

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