2549. For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³ ), while the C.V. is same on weight basis (i.e., kcal/kg) ?

Propane and acetylene
Propane and LPG
Sewage gas and gobar gas
B.F. gas and coke oven gas
✅ The correct answer is option A.

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