Question

How many of the following are elements:
Diamond, Graphite, Silica, Alumina, Sodium, and Water

• A. 5
• B. 3
• C. 7
• D. 8

Answer 1

Answer: (B)

3

Diamond and Graphite are made up of carbon atoms only. So, they are elements. Sodium(Na) made up of sodium atoms is also an element.

Silica ($Si{O}_2$), alumina ($A{l}_2{O}_3$) and water ($H_{2}O$) are compounds.

Therefore, there are three elements in the given list.

So, the correct option is B.