State one observation for:

1. Excess NH₄OH soln. is added to Pb(NO₃)₂
2. NaOH soln. is added to FeCl₃ soln. in excess.

State two relevant observations for the reaction:

Ammonium hydroxide solution is added to copper (II) nitrate solution in small quantities and then in excess.

To a salt solution 'Y' a small quantity of NH₄OH solution is added slowly and then in excess. A pale blue precipitate is formed which dissolves in ex­cess to form a clear inky blue solution. Identify the posi­tive ion in the salt 'Y'

State your observations when ammonium hydroxide solution is added drop by drop and then in excess to each of the following:

(i) copper sulphate solution

(ii) zinc sulphate solution.