The pair(s) of ions where BOTH the ions are precipitated upon passing H_(2)S gas in presence of dilute HCl is (are)

The pair(s) of ions where BOTH the ions are precipitated upon passing

1.	The pair(s) of ions where BOTH the ions are precipitated upon passing H_(2)S gas in presence of dilute HCl is (are)
Answer» `BA^(2+), ZN^(2+)` `Bi^(3+) , Fe^(3+)` `Cu^(2+), Pb^(2+)` `Hg^(2+), Bi^(3+)` Solution :`Cu^(2+), Pb^(2+), Hg^(2+) and Bi^(3+)` all lie in Group II of qualitative analysis and are PRECIPITATED from the solution on passing `H_(2)S` gas in the solution ACIDIFIED with dilute HCL.