Excess of dilute sodium hydroxide solution is gradually added with shaking to an aqueous solution of zinc sulphate. What would you observe?
(a) A light blue precipitate is first formed which finally dissolves to give a deep blue solution
(b) A white precipitate appears which dissolves to give a colourless solution.
(c) A white precipitation is formed which does not dissolve
(d) No change takes place and the solution remains clear