Match the following :- List - I (Pair of Ions) List - II (Reagent which can be used to precipitate only one ion from given pair of ions) (A) Cu + 2 , Zn + 2 (P) ( NH 4 ) 2 CO 3 (B) Zn + 2 , Ba 2

Question

Match the following :- List - I (Pair of Ions) List - II (Reagent which can be used to precipitate only one ion from given pair of ions) (A) Cu + 2 , Zn + 2 (P) ( NH 4 ​ ) 2 ​ CO 3 ​ (B) Zn + 2 , Ba 2 + (Q) ( HCl ( Aq . ) ​ + H 2 ​ S ) both (C) Cu + 2 , Ag + (R) dil HCl only (D) K + , Sr + 2 (S) Excess NaOH (T) Na 2 ​ SO 4 (Aq.) ​

TestHub · Accepted Answer

(A) Cu²⁺, Zn²⁺: H₂S/HCl (Q) precipitates only CuS, while excess NaOH (S) precipitates Cu(OH)₂ but dissolves Zn²⁺ as a soluble zincate complex.

(B) Zn²⁺, Ba²⁺: Na₂SO₄ (T) precipitates only BaSO₄; ZnSO₄ remains soluble.

(C) Cu²⁺, Ag⁺: Dilute HCl (R) precipitates only AgCl, and Na₂SO₄ (T) precipitates Ag₂SO₄ while CuSO₄ is highly soluble.

(D) K⁺, Sr²⁺: (NH₄)₂CO₃ (P) and Na₂SO₄ (T) both precipitate Sr²⁺ (as carbonate and sulfate respectively), whereas K⁺ salts are always soluble.

List - I (Pair of Ions)	List - II (Reagent which can be used to precipitate only one ion from given pair of ions)
(A) $Cu^{+ 2}, Zn^{+ 2}$	(P) $(NH_{4})_{2} CO_{3}$
(B) $Zn^{+ 2}, Ba^{2 +}$	(Q) $(HCl_{(Aq .)} + H_{2} S)$ both
(C) $Cu^{+ 2}, Ag^{+}$	(R) dil HCl only
(D) $K^{+}, Sr^{+ 2}$	(S) Excess NaOH
	(T) $Na_{2} SO_{4 (Aq.)}$

Chemistry - Salt Analysis Question with Solution | TestHub

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