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Ashes with fusion temperature above than 1430^oC are called as ___________

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Ashes with fusion temperature above than 1430^oC are called as ___________

(a) Fixed ash

(b) Free ash

(c) Refractory ash

(d) Fusible ash

The question was asked in homework.

This intriguing question originated from Coal in division Fuels and Combustion of Engineering Chemistry II

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Correct option is (c) Refractory ash

For explanation: The ash which is present within the mass of coal is called as fixed ash. Fusible ash is the ash that has a fusible temperature less than 1200^oC. Free ash can be removed by washing of coal.

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