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

Options

A. `2Mg(s)+O_(2)(g)rarr 2MgO(s)`
B. `C_(3)H_(8)(s)+O_(2)(g)rarr CO_(2)(g) + H_(2)O(g)`
C. `P_(4)(s)+5O_(2)(g) rarr P_(4)O_(10)(s)`
D. `CH_(4)(g)+2O_(2)(g) rarr CO_(2)(g) + 2 H_(2)O(g)`

Answer

B

Explanation

In this equation,
`underset(44" g")(C_(3) H_(8))(g)+underset(32" g")(O_(2)(g)) rarr underset(44" g")(CO_(2)(g))+underset(18" g')(H_(2)O)(g)`
i.e., mass of reactants `ne` mass of products.
Hence, law of conservation of mass is not followed.