A) Coal gas
B) Water gas
C) Producer gas
D) Carbon dioxide gas
Correct Answer: A
Solution :
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. \[coal\text{ }gas>water\text{ }gas>producer\text{ }gas\]
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