railway RRB JE (CBT I + CBT II) Mock Test 2024 General Science Chemistry Basic Concepts of Chemistry
In which one of the following chemical equations is the Law of Conservation of mass violated?
1
N2(g) + 3H2(g) → 2NH3(g)
2
2Fe(S) + 3H2O(g) → Fe2O3(s) + 3H2
3
2Na(S) + 2H2O → 2NaOH + H2(g)
4
2C2H6(g) + 6O2 → 4CO2(g) + 6H2O