Ncert Exercises & Solutions

Identify the reaction that does not obey the law of conservation of mass from the provided options:

1. $2 Mg (s) + O_{2} (g) \to 2 MgO (s)$

2. $C_{3} H_{8} (g) + O_{2} (g) \to {CO}_{2} (g) + H_{2} O (g)$