Question

Pick out the odd one from amongst the following which does not belong to the set:

Hydrogen, steam, graphite, gold.

Answer 1

1. Elements: A pure substance that can neither be reduced further nor can be formed by physical or chemical methods and is made up of same type of atoms.
2. Compounds: It is a substance that is formed by mixing two or more elements in a defined ratio.
3. Hydrogen, Graphite and Gold are examples of elements made of same type of atoms which cannot be broken down further.
4. Steam is the gaseous state of water (${\mathrm{H}}_2\mathrm{O}$) which is a compound formed by mixing hydrogen and oxygen in a fixed ratio.

Therefore, the odd one that does not belong to the set is steam.