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What is the appearance of oven coke?

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in Engineering Material & Metallurgy by (773k points)
What is the appearance of oven coke?

(a) Bluish-green

(b) Reddish-brown

(c) Dark grey to light silver

(d) Matte black

This question was addressed to me in final exam.

Query is from Cements, Metallurgical Coke and Synthetic Resins topic in portion Miscellaneous Materials of Engineering Material & Metallurgy

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The correct option is (c) Dark grey to light silver

Best explanation: Oven coke made either in by-product or beehive ovens may appear as a dull dark grey to light silver grey in color and are lustrous. They are hard and may appear with a few cracks and fractures.

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