What are the formulae of the compounds formed when lanthanoids $(Ln)$ react with nitrogen and halogen respectively?

  • A
    $LnN$ and $LnX_3$
  • B
    $LnN_3$ and $LnX$
  • C
    $(Ln)_2 N_3$ and $LnX_3$
  • D
    $LnN$ and $LnX$

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