Fuels and Combustion
Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of

BaSO₄ & NaCl
MgO & Na₂CO₃
MgSO₄ & BaCl₂
MgCO₃ & NaCl

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Fuels and Combustion
With increase in the temperature of carbonisation of coal

Methane content in the coke oven gas decreases and carbon monoxide content increases
Hydrogen content of coke oven gas increases due to cracking of hydrocarbons
Calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H? content
All of these

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