QUESTION

Which of the following is NOT a solution?

• A. brass
• B. stainless steel
• C. zinc
• D. sterling silver

ANSWER

Choice C (Zinc) is the correct answer.

Zinc is an element, which is a substance with only one kind of atom.

The rest of the choices however, are alloys which are solid solutions (homogenous mixture of two or more substances) composed of at least a metal and another metal or element dissolved.

• Brass is an alloy of copper and zinc.
• Stainless steel is an alloy of iron, chromium, and some nickel or copper.
• Sterling silver is an alloy of silver and copper, sometimes zinc and other metals.

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