Consider the following statements for solid fuels: 1. Peat is the first stage in the formation of coal from wood. 2. The average calorific value of bituminous coal is 1524 kJ/kg. 3. Anthracite is very hard coal and has a shining black lustre. 4. Wood charcoal is obtained by destructive distillation of wood. Which of the above statements are correct?
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