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Which of the following is not used as an additive?

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in Casting-Forming-Welding I by (687k points)
Which of the following is not used as an additive?

(a) Dextrin

(b) Coal dust

(c) Pitch

(d) Zinc

I had been asked this question by my school principal while I was bunking the class.

I want to ask this question from Mold Materials topic in portion Molding and Core Sands of Casting-Forming-Welding I

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Best answer
The correct choice is (d) Zinc

Explanation: Zinc is an alloying element and is not considered as additive.

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