(a) of the ions `A^(+),CO^(2+)` and `Ti^(+)`, which one will be coloured in aqueous solution? (Atomic no. s: Ag=47,Co=27,Ti=22)
(b) If each ore each one of the above ionic species is in turn placed in a magnetic field, how will it respond and why?

Answer

(a) `CO_(2+)` will be coloured because it contains unpaired electrons. On the other hand ,`Ag^(+)` has completely filled `3d` subshell and `Ti^(4+)` has empty `3d` subshell, therefore , they will be coloureless.
(b) `Co^(2+)` will be attracted by a magnetic field while `Ag^(+)` and `Ti^(4+)` ions will be repelled.