Question

The calorific values of wood, bituminous coal, natural gas and charcoal vary in the order:

• A. wood > bituminous > natural gas > charcoal
• B. wood > bituminous coal > charcoal > natural gas
• C. natural gas > charcoal > bituminous coal > wood
• D. natural gas> bituminous coal> wood> charcoal

Answer 1

The correct option is C natural gas > charcoal > bituminous coal > wood

Natural gas $=43000kJ/kg$

Charcoal $=29600kJ/kg$

Bituminous coal $=23250kJ/kg$

Wood $=17400kJ/kg$