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A formula giving the gross heating value of coal in terms of the weight fractions of carbon, hydrogen, oxygen and sulphur from the _________

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A formula giving the gross heating value of coal in terms of the weight fractions of carbon, hydrogen, oxygen and sulphur from the _________

(a) ultimate analysis

(b) proximate analysis

(c) distillation

(d) filtration

I had been asked this question during a job interview.

I need to ask this question from Dullong’s Formula topic in section Fuel Technologies of Applied Chemistry

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Correct answer is (a) ultimate analysis

To explain I would say: The percentages of the coal components are given by ultimate analysis and the proximate analysis is used to know the percentages of volatile matter, moisture, etc.

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