For per gram of reactant, the maximum quantity of N2 gas is produced in which of the following thermal decomposition reactions?
1) 2BaCrO4 → 2BaO + 2CrO₃ + O2
2) 2BaCrO4 → 2BaO + Cr₂O₃ + O2
3) 2BaCrO4 → 2BaO + 2CrO2 + O2
4) 2BaCrO4 → 2BaO + CrO2 + O2