Arun was wondering how coals are categorised into energy quality grades. What is the parameter for classifying coals? Do you know?

Weight of coal

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Moisture content of coal

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Carbon content

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By burning

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Solution

The correct option is B
Moisture content of coal

The coal gradation is determined by the proportion of carbon to moisture. Higher the proportion of carbon to moisture the higher the energy content.

The coal grade is accompanied by increases in the amount of fixed carbon and by decreases in the amount of moisture and other volatile material in the coal.

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