(a) of the ions `Ag^(+),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?

Explanation

(a) of the ions `Ag^+ (4d^10), Co^(2+)(3d^7)` and `Ti^(4+ )(3s^(2) 3p^6), Co^(2+ )` will be coloured in aqueous solution because it contains unpaired electrons in d-subshell.
(b) `Co^(2+)` will be attracted by the magnetic field and is paramagnetic.
( c) `Ag^+` and `Ti^(4+)` will be repelled by the magnetic field and are diamagnetic.