Which equations represent the incomplete combustion of methane?I. CH4(g) + 2 O2(g) $rightarrow$ CO2(g) + 2 H2O(g)II. CH4(g) + 1 1/2 O2(g) $rightarrow$ CO(g) + 2 H2O(g)III. CH4(g) + O2(g) $rightarrow$ C(s) + 2 H2O(g)

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Which equations represent the incomplete combustion of methane?I. CH4(g) + 2 O2(g)

A	I and II only
B	I and III only
C	II and III only
D	I, II and III

Explanation:

Detailed explanation-1: -In complete combustion, Methane releases CO2andH2O. Hence, the reaction CH4+O2⟶C(s)+2H2O(l) shows incomplete combustion.

Detailed explanation-2: -The equation for incomplete combustion of propane is: 2 C3H8 + 9 O2 → 4 CO2 + 2 CO + 8 H2O + Heat. If not enough oxygen is present for complete combustion, incomplete combustion occurs. The result of incomplete combustion is, once again, water vapour, carbon dioxide and heat. But it also produces carbon monoxide.

Detailed explanation-3: -The combustion of methane or octane is exothermic; it releases energy. CH4 + 2 O2 → CO2 + 2 H2O + energy The energies of the products are lower than the energiies of the reactants.

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SSC MTS EXAM

SSC

CHEMISTRY