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At what temperature should the coal be heated so as to determine the moisture content of coal?

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At what temperature should the coal be heated so as to determine the moisture content of coal?

(a) 90-100^oC

(b) 145-155^oC

(c) 125-140^oC

(d) 105-110^oC

I got this question in an online interview.

My question is based upon Coal topic in section Fuels and Combustion of Engineering Chemistry II

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The correct option is (d) 105-110^oC

Easy explanation: Moisture is generally determined by heating a known quantity of air-dried coal to 105-110^oC for one hour so as to get an exact value of the percentile of moisture. The loss of weight in coal determines the percentile of moisture in the coal. If the temperature is shifted from this position it will affect the percentile of oxygen.

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