The aqueous solution containing which one of the following ions will be colourless ? (Atomic no. Sc =21, Fe =26, Ti =22, Mn =25 )

Step-by-step solution

aligned & ₂₁ Sc =1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6 3 d^1, 4 s^2 & So, S c³⁺=1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6 aligned (It is colourless due to absence of unpaired electrons in d -stubshell) aligned & ₂₆ Fe =1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6 3 d^6, 4 s^2 & Fe ²⁺=1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6 3 d^6 aligned (It is coloured due to presence of four unpaired electrons in d -subshell.) gathered ₂₂ Ti =1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6 3 d^2, 4 s^2 Ti ³⁺=1 s^2, 2 s^2 2 p^6, 3 s^2, 3 s^6 3 d^1 gathered (It is coloured due to pres