Question

Odd one out:Sodium sulphate, magnesium sulphate,ferrous sulphate and aluminium sulphate

Answer 1

Answer:

magnesium sulphate

Explanation:

Answer 2

Among the given compounds, ferrous sulphate is the odd one out.

• In all the given compounds, the anion is common, SO4²⁻ (sulphate anion). Therefore, the basis of difference is their respective cations.

• Sodium sulphate contains sodium cation. Sodium is an element of period 3.

• Magnesium sulphate contains magnesium as the cation. Magnesium is also an element of the third period.

• In aluminum sulphate, the cation present is aluminum. Aluminum, again, is an element of period 3.

• Ferrous sulphate is made up of ferrous cation and sulphate anion. Ferrous cation or iron belongs to the fourth period in periodic table.

• Thus, among all the given options, ferrous sulphate is the only compound whose cation does not belong to period 3. Therefore, it is the odd one out.