1.

Which of the following represents the correct increasing order of calorific value of the given fuels?

A.  Hydrogen < LPG < Biogas < Cow dung cake < coal
B.  Cow dung cake < Biogas < LPG < Coal < Hydrogen
C.  Vitamins
D.  Hydrogen < Cow dung cake < LPG < Biogas < Coal
Answer» D.  Hydrogen < Cow dung cake < LPG < Biogas < Coal


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