To determine the limiting reactant in this neutralization reaction, we need to compare the number of moles of each reactant present.
First, calculate the number of moles of sulphuric acid: 0.6 mol/L x 0.25 L = 0.15 moles
Next, calculate the number of moles of potassium hydroxide: 0.5 mol/L x 0.4 L = 0.2 moles
Since the number of moles of sulphuric acid (0.15 moles) is less than the number of moles of potassium hydroxide (0.2 moles), the limiting reactant in this reaction is the sulphuric acid.