The correct answer is Option (4) → (B) and (D) only
Analysis of the Compounds
- (A) Mohr's Salt: Its chemical formula is $FeSO_4\cdot(NH_4)_2SO_4\cdot 6H_2O$. This is a double salt. When dissolved in water, it dissociates completely into its constituent ions ($Fe^{2+}$, $NH_4^+$, and $SO_4^{2-}$).
- (B) Tetraamminediaquacobalt (II) ion: The formula is $[Co(NH_3)_4(H_2O)_2]^{2+}$. This is a coordination complex. The ligands ($NH_3$ and $H_2O$) are bonded to the central Cobalt ion via coordinate covalent bonds, and the complex ion remains as a single unit in solution.
- (C) Carnallite: Its chemical formula is $KCl\cdot MgCl_2\cdot 6H_2O$. This is another double salt. In an aqueous solution, it breaks down into simple $K^+$, $Mg^{2+}$, and $Cl^-$ ions.
- (D) Potassium ferricyanide: The formula is $K_3[Fe(CN)_6]$. This is a coordination complex. In water, it dissociates into $K^+$ ions and the $[Fe(CN)_6]^{3-}$ complex ion, which does not break down further into $Fe^{3+}$ and $CN^-$ ions.
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