Normality = Molarity$\times$Acidity (for a base)= Molarity$\times$Basicity(for an acid)

For 0.5 M H₂SO₄, Normality = 0.5$\times$2 = 1 N

For 0.2 M AlCl₃, Normality = 0.2$\times$3 = 0.6 N

For 0.1M NaCl, Normality = 0.1$\times$(charge on cation or anion)=0.1$\times$1=0.1N

For 0.5M H₃PO₄, Normality =0.5$\times$3=1.5

Hence, correct option is:  (C)