An air sample taken from the return airway of a district contains the following gases. The Graham's ratio for the district is
| Gas | CO2 | H4 | O2 | N2 | CO |
| Concentration % | 0.4 | 1.17 | 19.92 | 78.49 | 0.02 |
A. 5.6
B. 4.8
C. 3.0
D. 2.3
Answer: Option D
This Question Belongs to Mining Engineering >> Mine Ventilation
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