Which of the following pairs of names and formulas of complexes is not correct? |
Tetraamminecopper (II) sulphate - [Cu(NH3)4]SO4 Diamminesilver (I) chloride - [Ag(NH3)2]Cl Potassium hexacyanidoferrate (III) - K4[Fe(CN)6] Potassium amminepentachloridoplatinate (IV) - K[Pt (NH3)Cl5] |
Potassium hexacyanidoferrate (III) - K4[Fe(CN)6] |
The correct answer is option 3. Potassium hexacyanidoferrate (III) - K4[Fe(CN)6]. To determine which pair of names and formulas of complexes is not correct, we need to carefully analyze the coordination complexes provided: 1. Tetraamminecopper (II) sulphate - \([Cu(NH_3)_4]SO_4\) Name: Tetraamminecopper(II) sulphate Formula: \([Cu(NH_3)_4]SO_4\) Copper(II) ion (\(Cu^{2+}\)) is coordinated by four ammonia \((NH_3)\) ligands, forming the complex ion \([Cu(NH_3)_4]^{2+}\), which pairs with the sulfate ion (\(SO_4^{2-}\)). This is correct. 2. Diamminesilver (I) chloride - \([Ag(NH_3)_2]Cl\) Name: Diamminesilver(I) chloride Formula: \([Ag(NH_3)_2]Cl\) Silver(I) ion (\(Ag^{+}\)) is coordinated by two ammonia \((NH_3)\) ligands, forming the complex ion \([Ag(NH_3)_2]^{+}\), which pairs with a chloride ion \((Cl^-)\). This is correct. 3. Potassium hexacyanidoferrate (III) - \(K_4[Fe(CN)_6]\) Name: Potassium hexacyanidoferrate(III) Formula: \(K_4[Fe(CN)_6]\) The formula \(K_4[Fe(CN)_6]\) corresponds to the anion \([Fe(CN)_6]^{4-}\), which is actually the hexacyanidoferrate(II) complex. The correct name for \(K_4[Fe(CN)_6]\) is potassium hexacyanidoferrate(II). Therefore, this pair is not correct. 4. Potassium amminepentachloridoplatinate (IV) - \(K[Pt(NH_3)Cl_5]\) Name: Potassium amminepentachloridoplatinate(IV) Formula: \(K[Pt(NH_3)Cl_5]\) Platinum(IV) ion (\(Pt^{4+}\)) is coordinated by one ammonia \((NH_3)\) ligand and five chloride \((Cl^-)\) ligands, forming the complex ion \([Pt(NH_3)Cl_5]^{-}\), which pairs with a potassium ion \((K^+)\). This is correct. Conclusion: The incorrect pair of name and formula is: Potassium hexacyanidoferrate (III) - \(K_[Fe(CN)_6]\). The correct name for \(K_4[Fe(CN)_6]\) is potassium hexacyanidoferrate(II). |