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Which of the following is not an advantage of the cleaning of coal?

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in Engineering Chemistry II by (789k points)
Which of the following is not an advantage of the cleaning of coal?

(a) It increases the cost of the coal

(b) It increases the efficiency of coal

(c) It removes the impurities like phosphorous and sulphur

(d) It reduces its ash content

This question was addressed to me in my homework.

The doubt is from Coal Technology topic in chapter Fuels and Combustion of Engineering Chemistry II

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The correct answer is (a) It increases the cost of the coal

The best I can explain: The cleaning of coal reduces impurities due to which it becomes easy to transport and store, which reduces the cost of the coal. It also increase the calorific value of the coal.

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