(a) Calculate the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25.
(b) Predict which of the following will be coloured in aqueous solution:
`Sc^(3+) ,Fe^(3+) , Ti^(4+), V^(3+)`
(Atomic nos. of Sc, Fe, Ti and V are 21, 26, 22 and 23 respectively)