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

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Which of the following reactions is not correct according to the law of conservation of mass ?
A. 2Mg(s)+O_(2)(g)rarr2MgO(s)
B. C_(3)H_(8)(g)+O_(2)(g)rarrCO_(2)(g)+H_(2)O(g)
C. P_(4)(s)+5O_(2)(g)rarrP_(4)O_(10)(s)
D. CH_(4)(g)+2O_(2)(g)rarrCO_(2)(g)+2H_(2)O(g)

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The reaction does not represent a balanced chemical equation according to the law of conservation of mass.