The compound(s) which generate(s) N2 gas upon thermal decomposition below 300°C is/are: NH4NO3, (NH4)2Cr2O7, Ba(N3)2, Mg3N2

(A) NH4NO3 Δ → N2O + 2H2O
(B) (NH4)2Cr2O7 Δ → N2 + Cr2O3 + 4H2O
(C) Ba(N3)2 Δ → Ba + 3N2
(D) Mg3N2 (it does not decompose into N2)
Hence, option B and C are correct.