Question

Identify the pure substance containing only one type of element.

• A. Sugar
• B. Diamond
• C. Silica
• D. Water

Answer 1

The correct option is B Diamond

Here sugar $\left(C_{12}{H}_{22}{O}_{11}\right)$ , silica $\left(Si{O}_2\right)$ and water $\left(H_{2}O\right)$ are compounds that contain more than one element.

Therefore, they are not pure substances.

While the diamond is an isotope of carbon only. Therefore diamond is a pure substance.

So, the correct answer is $B$.