The molecular formula of metaphosphoric acid is

  • A
    $H_3PO_4$
  • B
    $HPO_3$
  • C
    $H_2PO_3$
  • D
    $H_3PO_2$

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Explain why $NH_3$ is basic while $BiH_3$ is only feebly basic.

The number of oxygen atoms bonded to one phosphorus atom in $P_4O_6$ is

The structure of orthophosphoric acid is

Which of the following orders regarding the melting points of hydrides of group $15$ is correct?

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