Gaseous fuels due to their advantages over ther tupes of fuels are becoming highly popular . The advantages fo the fgaseous fuels are as follows :
a. High calorigic value .
b. Do not produce smoke and do not leave ash after combstion .
c. They can flow through pipes and can be ignige at a moment's notic eat any place . No sp-ecial devices are required for their combustion .
i. Coal gas is a good gaseous fuel as it conitains `95^5` combustible gaseous such as `H_2, CH_4, CO` etc , It is obtained buy destructive distillation of coal at ` 100^@ C` .
ii. Water gas is a mixture of ` CO` and `H_2` and is prepared by passing steam over incandescnt coke . The reaction is owever endothermic .
iii. Producer gas , which possesses low calorific value, so prepared by passing aair over red hot coke . It contains mainly nitrogen and ` CO`
iv. Semi-water gas is a mixture of water fas and producer fas .
v. oil gas , which is used in laboratries , is obtained by cracking of kerosene . It is a mixture of hydrocarbon (saturated and unsatureated ) mainly lower hudrocarons .
iv. `LPG`, which contains ` C_3` and ` C_4` hydrocarbon of the alkane and alkene serties , suppied in cylinders for domestic uses is very populsr these days .
Which fuel has the highest calorific value ?

Options

A. Coal gas
B. Water gas
C. Producer gas
D. Natural gas

Answer

A