Principles Related to Practical Chemistry · Question 1

The correct match of the group reagents in List-I for precipitating the metal ion given in List-II from solutions, is

1. P → 3; Q → 4; R → 2; S → 1
2. P → 4; Q → 2; R → 3; S → 1
3. P → 3; Q → 4; R → 1; S → 5
4. P → 5; Q → 3; R → 2; S → 4

Answer

(1) P → 3; Q → 4; R → 2; S → 1

Solution

(P) H2S in ammoniacal medium is the Group IV reagent. It precipitates MnS, so P → 3.

(Q) (NH4)2CO3 with NH4OH is the Group V reagent. It precipitates BaCO3, so Q → 4.

(R) NH4OH/NH4Cl is the Group III reagent. It precipitates Al(OH)3, so R → 2.

(S) H2S in dilute HCl is the Group II reagent. It precipitates CuS, so S → 1.

( Mg2+ is Group VI and is not precipitated by any of these.)

Answer: (A)