Question

Which of the following will melt between ${500}^{\mathrm{o}}\mathrm{C}\mathrm{to}{1500}^{\mathrm{o}}\mathrm{C}$ ?

• A. Sugar
• B. Graphite
• C. Glass
• D. Salt

Answer 1

The correct option is C

Glass

Explanation for correct option:

C. Glass

Amorphous solid:

• “An amorphous solid (Greek amorphos = 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.

Glass is an amorphous solid as it will melt between ${500}^{\mathrm{o}}\mathrm{C}\mathrm{to}{1500}^{\mathrm{o}}\mathrm{C}$ . If an amorphous solid is kept at a melting point for a longer period of time then component molecules/atoms/ions will rearrange themselves into a crystalline structure that has highly ordered arrangements.

Explanation for incorrect options:

Sugar, graphite as well as salt are crystalline solid as they have a regular arrangement of atoms. Thus options A, B, and D.

Hence, the correct option is C i.e. Glass.