Chemical Process
High temperature carbonisation of coal produces

Inferior coke compared to low temperature carbonisation
Larger quantity of tar compared to low temperature carbonisation
None of these
Less of gases compared to liquid products

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Chemical Process
Presence of carbonaceous matter in the sewage

Increases the quantity of chlorine used for its purification
Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
Reduces sulphate ions to sulphides causing obnoxious smell
All of these

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Chemical Process
Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its

All of these
Greater tendency of decomposition at elevated temperature
Hydrolysis tendency in presence of water
Poor oxidation stability and high gum forming tendency

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