1.

State two relevant observations for each of the following : (i) Ammonium hydroxide solution is added to copper (II) nitrate solution in small quantities and then in excess. (ii) Ammonium hydroxide solution is added to zinc nitrate solution in minimum quantities and then in excess. (iii) Lead nitrate crystals are heated in a hard glass test tube.

Answer»

(i) Initially a light blue ppt is formed which on addition of excess of ammonium hydroxide dissolves and a deep inky blue solution is formed. 

(ii) Initially a white ppt is formed which disappears (dissolves) in excess of ammonium hydroxide. 

(iii) A reddish brown gas is evolved and a yellow residue is left in the test tube.



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