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To find the % of volatile matter in coal, it must be heated in the crucible at ______ temperature.

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To find the % of volatile matter in coal, it must be heated in the crucible at ______ temperature.

(a) 5261^0C

(b) 3281^0C

(c) 825^0C+10^0C

(d) 925^0C+20^0C

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This intriguing question comes from Analysis of Coal and Selection in section Fuel Technologies of Applied Chemistry

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Correct choice is (d) 925^0C+20^0C

For explanation: The moisture free coal is taken into a silica crucible and again it is heated at the temperature 925^0C+20^0C for 7 minutes then it is first cooled in air and late in a dessicator.

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