Incomplete combustion of methane forms –

C O_{2} + H_{2} O

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C O + H_{2} O

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C O_{2} + H_{2}

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C O + O_{2}

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Solution

The correct option is B $C O + H_{2} O$
Complete combustion of a hydrocarbon fuel gives $C O_{2}$ and $H_{2} O$ whereas incomplete combustion results in the formation of CO, $C O_{2}$ and $H_{2} O$ .
Incomplete combustion occurs when the supply of air or oxygen is poor. Water is still produced, but carbon monoxide and carbon are also produced in a large amount along with carbon dioxide. The carbon is released as soot.
$4 C H_{4}_{(g)} + 7 O_{2}_{(g)} \to 2 C O_{(g)} + 2 C O_{2}_{(g)} + 8 H_{2} O_{(l)}$

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Which amongst the following gas is formed during the incomplete combustion of carbon?

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