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. Which of the following combination of compounds is soluble in water?

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. Which of the following combination of compounds is soluble in water?
Answer» `BaCl_(2) and AgNO_(3)` `AgNO_(3) and NaOH` `BaCl_(2) and Na_(2)SO_(4)` `ZnSO_(4) and` EXCESS `NaOH` 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`