Engineering Thermodynamics
According to Dalton's law, the total pressure of the mixture of gases is equal to

Average of the partial pressures of all
Greater of the partial pressures of all
Sum of the partial pressures of all
Sum of the partial pressures of all divided by average molecular weight

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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
None of these
Drying and crushing the coal to a fine powder

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