Choose the reactions which would liberate nitrogen gas?
A. `Ca(Ocl)Cl+NH_(3) underset("medium") overset("Aqueous")rarr`?
B. `NH_(3)+PbO overset(Delta)rarr?`
C. `NH_(3)("excess") +Cl_(2) overset(Delta) rarr`?
D. `NH_(4)Cl+NaNO_(2) overset(Delta) rarr?`