Glass is best described as:

Correct answer: (c) A supercooled solution

Explanation

Glass is an amorphous solid: its particles have no regular, repeating arrangement like a crystal. It forms when molten silicates (sand with soda and lime) are cooled quickly, so the particles freeze in place before they can arrange themselves.

So glass is described as a supercooled liquid, here called a supercooled solution. Unlike a crystalline solid, it has no sharp melting point and softens gradually over a range of temperatures.

• An alloy is a mixture of a metal with other metals or a non-metal, such as brass.
• A eutectic mixture melts at a single temperature lower than that of any of its parts.
• A gel is a colloid of a liquid spread through a solid, such as jelly.