Question

Which of the following materials fall in the category of a “pure substance”?
I) Ice
II) Calcium oxide
III) Mercury
IV) Brick

Answer 1

• Ice- It is a compound made up of hydrogen and oxygen elements. Hence, it is a pure substance.
• Calcium oxide- It is a compound made up of calcium and oxygen elements. Hence, it is a pure substance.
• Mercury- It is an element that contains only mercury particles. Hence, it is a pure substance.
• Brick- It is a mixture containing various particles that are physically combined. Hence, it is not a pure substance.

Therefore, options (c) is the correct answer.