Give examples and explain with equations:
(i) Two colourless solution give a ***** ppt. on mixing.
(ii) Two colourless solution give a red ppt. on mixing, soluble in excess of one of them.
(iii) Two colourless solutions give a white ppt. on mixing, soluble in ammonium hydroxide.
(iv) Two colourless solution give a yellow ppt. on mixing.
