Question

Which of the following reactions is not correct according to the law of conservation of mass?
(a) $2Mg (s) + O_2 (g) \longrightarrow 2MgO (s)$
(b) $C_3H_8 (g) + O_2 (g) \longrightarrow CO_2 (g) + H_2O (g)$
(c) $P_4 (s) + 5O_2 (g) \longrightarrow P_4O_{10} (s)$
(d) $CH_4 (g) + 2O_2 (g) \longrightarrow CO_2 (g) + 2H_2O (g)$

Answer 1

mass can be neither be created nor destroyed so answer is 2 due unbalanced equation

Answer 2

reaction reaction we is not correct according to law of conservation of mass