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\(CH_4\) Liquefied natural gas \(C_4H_{10}\) Wet gas
 Natural gas\(C_2H_6\)  Mercaptan  Methane
 Compressed natural gas Dry gas Fossil fuel\(C_3H_8\)
  
1.
The chemical formula for ethane is .
 
2.
 is mixed with LPG to help in the detection of any leakage of LPG.
 
3
Natural gas is a  .