The compound that does not produce nitrogen gas by the thermal decomposition is:

$\left(\mathrm{a}\right) \mathrm{Ba}{\left({\mathrm{N}}_3\right)}_2\stackrel{\mathrm{\Delta }}{⟶}\mathrm{Ba}+3{\mathrm{N}}_2$
$\text{ (b) }{\left({\mathrm{NH}}_4\right)}_2{\mathrm{Cr}}_2{\mathrm{O}}_7\stackrel{\mathrm{\Delta }}{⟶}{\mathrm{Cr}}_2{\mathrm{O}}_3+{\mathrm{N}}_2+4{\mathrm{H}}_2\mathrm{O}$
$\text{ (c) }{\mathrm{NH}}_4{\mathrm{NO}}_2\stackrel{\mathrm{\Delta }}{⟶}{\mathrm{N}}_2+2{\mathrm{H}}_2\mathrm{O}$
$\text{ (d) }{\left({\mathrm{NH}}_4\right)}_2{\mathrm{SO}}_4\stackrel{\mathrm{\Delta }}{⟶}2{\mathrm{NH}}_3+{\mathrm{H}}_2{\mathrm{SO}}_4$
NH₃ is evolved in reaction (c).