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Determination of ash content of coal during its proximate analysis the...

This question belongs to Metallurgical Engineering Metallurgical Analysis
Metallurgical Analysis
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Determination of ash content of coal during its proximate analysis, the temperature of weighed coal sample is raised to 400 - 500°C in half an hour and maintained at the same level for further half an hour. The temperature is then raised to . . . . . . . . °C at which the sample is heated for one more hour before weighing it.

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Correct Answer: Option A
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