The following statements concern elements in the periodic table. Which of the following is true?

  • A
    For Group $15$ elements,the stability of $+5$ oxidation state increases down the group
  • B
    Elements of Group $16$ have lower ionization enthalpy values compared to those of Group $15$ in the corresponding periods
  • C
    The Group $13$ elements are all metals
  • D
    All the elements in Group $17$ are gases

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$A$ hydride of nitrogen which is acidic is

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