Identify the reaction which does not liberate $N_2$.

  • A
    $2 NaN_3 \xrightarrow{\Delta} 2 Na + 3 N_2$
  • B
    $(NH_4)_2Cr_2O_7 \xrightarrow{\Delta} Cr_2O_3 + N_2 + 4 H_2O$
  • C
    $2 NH_4Cl + Ca(OH)_2 \longrightarrow CaCl_2 + 2 NH_3 + 2 H_2O$
  • D
    $Ba(N_3)_2 \xrightarrow{\Delta} Ba + 3 N_2$

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