The ratio of air required for complete combustion of carbon to carbon
dioxide and that to carbon monoxide is:
कार्बन के पूर्ण दहन के लिए आवश्यक वायु का कार्बन डाइऑक्साइड और कार्बन मोनोऑक्साइड का अनुपात है:
0.5
2.0
4.0
1
2.0
We know that,
Atomic weight of carbon = 12
Atomic weight of oxygen = 16
So, for carbon dioxide
For complete combustion of 12 unit of
carbon, we need 32 unit of oxygen
∴
For 1 unit of carbon 
unit of oxygen is required
Ratio of oxygen (air) required for complete
combustion of carbon and carbon monoxide is,
= 2
Hence, the correct option is (B).
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