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Which of the following is not an amorphous material?

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Which of the following is not an amorphous material?

(a) Glass

(b) Plastics

(c) Lead

(d) Rubbers

This question was addressed to me during an online interview.

The question is from Types of Solids, Crystal Structures and Lattices topic in division Solid Solutions & Crystallography of Engineering Material & Metallurgy

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The correct answer is (c) Lead

For explanation: Materials in which the molecule is the basic structural solid and has an irregular structure are known as amorphous solid. Most amorphous materials are polymers such as plastics and rubbers. The most common amorphous material is glass.

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