An unknown mixture contains one or two of the following: CaCO_(3),BaCl_(2),AgNO_(3),Na_(2)SO_(4),ZnSO_(4) and NaOH. The mixture is completely soluble in water and solution gives pink colour with phenolphthalein. When dilute hydrochloric acid is gradually added to the solution, a precipitate is formed which dissolved with further addition of the acid. Q. The white precipitate is

An unknown mixture contains one or two of the following: CaCO_(3),BaCl

1.	An unknown mixture contains one or two of the following: CaCO_(3),BaCl_(2),AgNO_(3),Na_(2)SO_(4),ZnSO_(4) and NaOH. The mixture is completely soluble in water and solution gives pink colour with phenolphthalein. When dilute hydrochloric acid is gradually added to the solution, a precipitate is formed which dissolved with further addition of the acid. Q. The white precipitate is
Answer» `ZnSO_(4)` `Zn_(2)ZnO_(2)` `Zn(OH)_(2)` `ZnCl_(2)` SOLUTION :Mixture contains `NaOH+ZnSO_(4)` `NaOH+ZnSO_(4) to underset("soluble")(Na_(2)ZnO_(2))+Na_(2)SO_(4)+2H_(2)O` `Na_(2)ZnO_(2)+2HCl to 2NaCl+Zn(OH)_(2)darr` `Zn(OH)_(2)+2HCl to underset("soluble")(ZnCl_(2))+2H_(2)O`