Question

Which of the following is an element ?

• A. Hydrogen
• B. Salt
• C. Water
• D. Glucose

Answer 1

The correct option is A

Hydrogen

An element is a pure substance made up of only the same type of particles or atoms. it can not contain more than one type of atom.

For example, Iron is made up of only iron atoms, Silver is made up of only silver atoms.

Here all other options like water ( ${\mathrm{H}}_2\mathrm{O}$), glucose (${\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6$), and salt ( $\mathrm{NaCl}$) are made up of two or more two types of atoms, while hydrogen is an element made up of hydrogen atoms only.

therefore hydrogen is the correct option