The fossil fuel P is formed under the earth by the decomposition of vegetable matter lying under water by the action of anaerobic bacteria. The major component of fuel P is Q. The fossil fuel P is used as a source of gas R needed to manufacture nitrogenous fertilisers. When P is filled in metal cylinders and used as a fuel in motor vehicles, it is called S. What are P, Q, R and S ?
P- Natural Gas,
Q- Methane,
R- Hydrogen and
S- Compressed Natural Gas (CNG).