One mole of Aluminium Sulphate Al₂(SO₄)₃ contains:

The correct option is 12 moles of oxygen atoms.

To find the number of moles of oxygen atoms in one mole of aluminium sulphate, we analyze its chemical formula:
${\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3$

From the chemical formula, we can break down the constituent parts of one formula unit of aluminium sulphate:
1. It contains 2 aluminium ($\mathrm{Al}$) atoms.
2. It contains 3 sulphate (${\mathrm{SO}}_4$) groups.

Each sulphate (${\mathrm{SO}}_4$) group contains 1 sulphur atom and 4 oxygen atoms. Since there are 3 such sulphate groups, the total number of oxygen atoms in one formula unit of aluminium sulphate is:
$3\times 4=12$

Since the ratio of atoms in a single formula unit scales directly to moles:
1 mole of ${\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3$ contains 12 moles of oxygen atoms.