Why `Zn^(2+)` salts are white while `Ni^(2+)` salts are blue

Why Zn^(2+) salts are white while Ni^(2+) salts are coloured?

Why Zn^(2+) salts are white while Ni^(2+) salts are coloured?

Why Zn^(2+) salts are white while Ni^(2+) salts are coloured?

Give reason: Zn^(2+) salts are white while Cu^(2+) salts are blue.

Why Cd^(2+) salts are white ?

(a) What is Lanthanoid contration ? What are its important effects ? (b) Account for the following : (i) Zn^(2+) salts are white while Ni^(2+) salts are coloured. (ii) Ionisation enthalpies of 5d series elements are higher than the corresponding 3d series elements

Assign reasons for the following: (a) Zn^(2+) salts are white while Cu^(2+) salts are blue. (b) Separation of lanthanoid elements is difficult. Explain.

Zn^(2+) salts are white while Cu^(2+) salts are blue, explain why ?