Chemistry [3 Mark Question Answer]

State one relevant observation for each of the following reactions :
(i) Ammonium hydroxide solution is added to zinc nitrate solution in minimum quantities and then in excess.
(ii) Action of Sodium hydroxide solution on ferrous sulphate solution.
(iii) Lead nitrate solution is treated with sodium hydroxide solution drop wise till it is in excess.

State one relevant observation for each of the following reactions :
(i) Excess of ammonium hydroxide solution is added to lead nitrate solution.
(ii) Sodium hydroxide solution is added to ferric chloride solution at first a little and then in excess.
(iii) Ammonium hydroxide solution is added to copper (II) nitrate solution in small quantities and then in excess.

(a) Distinguish between Qualitative and Quantitative analysis.
(b) Define Reagent
(c) Define Precipitate

In a chemistry lab, a student is given a solution containing an unknown cation. The student adds sodium hydroxide (NaOH) to the solution and observes the formation of a blue precipitate. The student then decides to add ammonium hydroxide to a fresh sample of the solution in excess.
(a) Identify the cation.
(b) What happens when excess of NaOH is added in the solution?
(c) What happens when excess of ammonium hydroxide is added to the solution?

A student performs an experiment to identify an unknown cation present in a solution. The student adds a few drops of sodium hydroxide (NaOH) to the solution and observes the formation of a chalky white precipitate. When an excess of NaOH is added, the precipitate dissolves, forming a clear solution.
(a) Identify the cation.
(b) Write the balanced chemical equation for the reaction that leads to the formation of the white precipitate.
(c) What happens to the white precipitate when an excess of NH₄OH is added?