General Studies I
Mixture of which one of the following pairs of gases is the cause of occurence of most of the explosions in mines?
|A||Hydrogen and oxygen|
|B||Oxygen and acetyline|
|C||Methane and air|
|D||Carbon dioxide and methane|
Coal mine methane (CMM) is the term given to the gas trapped in coal seams, which has an approximate chemical composition of 70% methane, 15% carbon dioxide and 15% nitrogen. The gas is released once the seams are mined and can then escape to the atmosphere. Historically, underground mine explosions have been the cause of many injuries and fatalities, so reducing methane concentrations underground has aided mine safety operations.