carbon monoxide is naturally produced by oxidation of `…….` , a gas present in swamp area while it can be produced by `…..` of fuels containing carbon.

Options

A. ` X= CO_(2)`, Y = complete combustion
B. `x = CH_(4),` Y = incomplete combustion
C. X = C, Y = oxidation
D. ` X = CH_(4)`, Y = complete combustion

Answer

To answer the question, we need to fill in the blanks regarding the natural production of carbon monoxide and its production from fuels containing carbon.

### Step-by-Step Solution:

1. **Identify the Natural Source of Carbon Monoxide**:
- Carbon monoxide (CO) is naturally produced by the oxidation of organic matter. In swamp areas, the decomposition of organic materials leads to the production of gases, including carbon monoxide. The specific gas that can be mentioned here is methane (CH₄), which is produced during anaerobic decomposition in swamps.

2. **Identify the Source of Carbon Monoxide from Fuels**:
- Carbon monoxide is produced from the incomplete combustion of fossil fuels. Fossil fuels such as petrol and diesel contain carbon and hydrogen. When these fuels are burned in an environment with limited oxygen, incomplete combustion occurs, leading to the formation of carbon monoxide along with water vapor.

### Final Answer:
Carbon monoxide is naturally produced by the oxidation of **methane**, a gas present in swamp areas, while it can be produced by the **incomplete combustion** of fuels containing carbon.

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