Describe the colors of the following solutions:
(i) Copper Sulphate
(ii) Ferrous Sulphate
(iii) Zinc Sulphate
(iv) Aluminum Sulphate
(i) Copper Sulphate - Blue
(ii) Ferrous Sulphate – Pale Green
(iii) Zinc Sulphate – Colourless
(iv) Aluminum Sulphate – Colourless