The number of coloured and paramagnetic ions from the following in aqueous solution are \ \ \ \. Ti^3+, Co^2+, Ni^2+, Cu^2+, Cu^+, Ti^4+, Zn^2+,…

The number of coloured and paramagnetic ions from the following in aqueous solution are \_\_\_\_. $$\mathrm{Ti}^{3+}, \mathrm{Co}^{2+}, \mathrm{Ni}^{2+}, \mathrm{Cu}^{2+}, \mathrm{Cu}^{+}, \mathrm{Ti}^{4+}, \mathrm{Zn}^{2+}, \mathrm{Sc}^{3+} $$Given Atomic no. Sc, $\displaystyle 21$; Ti, $\displaystyle 22$; Co, $\displaystyle 27$; Ni, $\displaystyle 28$; Cu, $\displaystyle 29$; Zn, $\displaystyle 30$