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Exothermic material does not contain which of the following metal oxide?

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in Casting-Forming-Welding I by (687k points)
Exothermic material does not contain which of the following metal oxide?

(a) Cobalt

(b) Copper

(c) Iron

(d) Magnesium

This question was addressed to me in an interview for job.

My doubt is from Functions of a Riser topic in division Pattern and Mould, Principles of Gating & Risering of Casting-Forming-Welding I

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The correct answer is (d) Magnesium

Best explanation: Exothermic materials are those which generate a lot of heat because of exothermic chemical reactions. Exothermic materials do not include oxides of magnesium.

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