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For the granular refractories, what is the melting point of Carbon?

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in Casting-Forming-Welding I by (687k points)
For the granular refractories, what is the melting point of Carbon?

(a) 6800°F

(b) 6200°F

(c) 6400°F

(d) 6500°F

This question was posed to me in an international level competition.

This interesting question is from Indian Sand and core sand in portion Molding and Core Sands of Casting-Forming-Welding I

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The correct choice is (c) 6400°F

The explanation: According to the properties of granular refractories, Carbon has a melting point temperature of 6400°F. Among all the granular refractories, the melting point of carbon is considered to be the highest.

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