Number of ions which gives blue colour in aqueous state:

${\mathrm{V}}^{+4},{\mathrm{Ni}}^{+2},{\mathrm{Ti}}^{+3},{\mathrm{Co}}^{+2},{\mathrm{Fe}}^{+3},{\mathrm{Cu}}^{+2}$

Colour of $N{i}^{2+}$ in aqueous state is Green
Colour of $V^{4+}$ in aqueous state is Blue
Colour of $T{i}^{\mathit{3}\mathit{+}}$ in aquesous state is Purple
Colour of $C{O}^{\mathit{2}\mathit{+}}$ in aqueous state is Pink
Colour of ${\mathrm{Fe}}^{3+}$ in aqueous state is Yellowe
colour of ${\mathrm{Cu}}^{2+}$ in aqueoas state is Blue

Thus, ${\mathrm{V}}^{+4},{\mathrm{Cu}}^{+2}$ gives blue colour in aqueous state.