Question

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

Milk, honey, coal, brass, common salt.

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. Mixtures: It is a substance made by mixing two or more pure substances in an undefined proportion.
4. Milk, honey, coal and brass are examples of mixtures formed by mixing two or more pure substances in a variable ratio.
5. Milk is a mixture of oil and water.
6. Honey is a mixture of many natural substances.
7. Coal is a mixture of many inorganic elements.
8. Brass is a mixture of copper and zinc.
9. Common salt is a compound having a molecular formula of $\mathrm{NaCl}$ (Sodium chloride) in which two elements sodium and chloride are mixed in a defined ratio.

Therefore, the odd one that does not belong to the given set is common salt ($\mathrm{NaCl}$).