What is the effect of shaking dilute $\mathrm{H}_{2} \mathrm{SO}_{4}$ with a small quantity of anhydrous $\mathrm{CuSO}_{4}$ ?
(a) The white solid dissolves to form a colourless solution $\square$
(b) The white solid dissolves to form a green solution $\square$
(c) The white solid dissolves to form a blue solution $\square$
(d) The white solid turns blue but does not dissolve