Question

Which of the following reactions is not correct according to the law of conservation of mass.

Options

• \[\ce{2Mg(s) + O2(g) -> 2MgO(s)}\]

• \[\ce{C3H8(g) + O2(g) -> CO2(g) + H2O(g)}\]

• \[\ce{P4(s) + 5O2(g) -> P4O10(s)}\]

• \[\ce{CH4(g) + 2O2(g) -> CO2(g) + 2H2O(g)}\]

Answer 1

\[\ce{C3H8(g) + O2(g) -> CO2(g) + H2O(g)}\]

Explanation:

\[\ce{C3H8 + O2 -> CO2 + H2O}\]

Since the reaction is not balanced, hence, mass of reactants and products are different. It is against the law of conservation of mass.