NEET 2023 Phase 1 · ChemistryWerner theoryPrevious Year Question

Which of the following forms a set of a complex and a double salt, respectively?

Answer: (A) $K X_{2} PtCl X_{2} \cdot 2 NH X_{3}$ and $KAl (SO X_{4}) X_{2} \cdot 12 H X_{2} O$ . \textbf{Answer:} (A) $K X_{2} PtCl X_{2} \cdot 2 NH X_{3}$ (complex) and $KAl (SO X_{4}) X_{2} \cdot 12 H X_{2} O$ (double salt).

A. $K X_{2} PtCl X_{2} \cdot 2 NH X_{3}$ and $KAl (SO X_{4}) X_{2} \cdot 12 H X_{2} O$ ✓
B. $NiCl X_{2} \cdot 6 H X_{2} O$ and $NiCl X_{2} (H X_{2} O) X_{4}$
C. $CuSO X_{4} \cdot 5 H X_{2} O$ and $CuCl X_{2} \cdot 4 NH X_{3}$
D. $PtCl X_{2} \cdot 2 NH X_{3}$ and $PtCl X_{4} \cdot 2 HCl$

Correct Answer

(A) $K X_{2} PtCl X_{2} \cdot 2 NH X_{3}$ and $KAl (SO X_{4}) X_{2} \cdot 12 H X_{2} O$

Solution & Explanation

\textbf{Answer:} (A) $K X_{2} PtCl X_{2} \cdot 2 NH X_{3}$ (complex) and $KAl (SO X_{4}) X_{2} \cdot 12 H X_{2} O$ (double salt). \textbf{Solution:} Werner distinguished two kinds of addition compounds. A double salt dissociates completely in water into all of its constituent simple ions and loses its identity in solution. A coordination (complex) compound retains a stable complex ion in solution that does not fully dissociate. $KAl (SO X_{4}) X_{2} \cdot 12 H X_{2} O$ (potash alum) is the classic double salt: in water it gives $K X^{+}$ , $Al X^{3 +}$ and $SO X_{4} X^{2 -}$ ions independently, showing the properties of each simple salt. The platinum-ammine $K X_{2} PtCl X_{2} \cdot 2 NH X_{3}$ contains a stable complex ion (a coordinated Pt–ammine–chloride sphere) and behaves as a coordination compound. Hence the complex + double-salt pair is option (A).

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