Question

Which of the following is not an amorphous substance?

• A. Glass
• B. Copper
• C. Rubber
• D. Polymers

Answer 1

The correct option is B

Copper

Explanation for correct option:

B. Copper

Amorphous solid:

• “An amorphous solid (Greek amorphous = no form) consists of particles of irregular shape.”
• “The arrangement of constituent particles (atoms, molecules or ions) in such a solid has only short-range order.”
• Examples of amorphous solids are Glass. rubber as well as Plastics.

Thus, copper is not an amorphous substance rather it is a crystalline solid.

Explanation for incorrect options:

Glass, Rubber, and polymers are amorphous substances while copper is not an amorphous substance.

Glass is an amorphous solid as it exhibits glass transition and also there is no regularity in the arrangements of atoms/molecules. Similarly, rubber and polymers are also amorphous due to their irregular arrangements. Thus options A, C, and D stand incorrect.

Hence, the correct option is B i.e. Copper.