Question

Which of the following has the highest calorific value?

• A. Coal gas
• B. Water gas
• C. Producer gas
• D. Carbon dioxide gas

Answer 1

Answer: (A)

Coal gas with $H_2(49\%),C{H}_4(32\%)$ and $CO(8\%)$ has the highest calorific value. Water gas with $CO(48\%)$ and $H_2(51\%)$ has lesser calorific value than coal gas. Producer gas with $CO(35\%)$ and $N_2(65\%)$ has a still lesser calorific value. $C{O}_2$ has no calorific value. Thus calorific values decrease in the order.
coal gas $>$ water gas $>$ producer gas