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

(i)2Mg(s) + O_{2} (g) \rightarrow 2MgO(s)

(ii) C_{2} H_{8} (g) + O_{2} (g) \rightarrow CO_{2} (g) + H_{2}O(g)

(iii) P_{4}(s) + 5O_{2}(g) \rightarrow P_{4}O_{10}(s)

(iv) CH_{4}(g) + 2O_{2}(g) \rightarrow CO_{2}(g) + 2H_{2}O(g)

 

Answers (1)

The answer is the option (ii) C_{2} H_{8} (g) + O_{2} (g) \rightarrow CO_{2} (g) + H_{2}O(g)

Explanation:

Again, following the Law of energy, the number of atoms on the reactant side should be equal to the product side. Option (ii) does not follow the rule.

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