Engineering Thermodynamics
According to First law of thermodynamics,

Work-done by a system is equal to the heat transferred by the system
Total energy of a system remains constant
Total internal energy of a system during a process remains constant
Internal energy, enthalpy and entropy during a process remain constant

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Engineering Thermodynamics
Carbonization of coal consists of

Heating the wood with a limited supply of air to temperature not less than 280°C
Moulding the finely ground coal under pressure with or without a binding material
Drying and crushing the coal to a fine powder
None of these

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