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Which of the following is a disadvantage of storing coal for a long period of time?

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Which of the following is a disadvantage of storing coal for a long period of time?

(a) Increase in the friability of coal

(b) Decrease in its ignition temperature

(c) Increase in its calorific value

(d) Increase in the proportion of fine

The question was asked in my homework.

The query is from Coal Technology in portion Fuels and Combustion of Engineering Chemistry II

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Best answer
Correct option is (d) Increase in the proportion of fine

The best I can explain: When the coal is stored for a long period of time, it leads to slow oxidation which causes deterioration of the coal. This process causes an increase in the proportion of fine which are not easy to cure. Also the oxidation of coal can lead to its spontaneous combustion.

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