Question:
Which of the following complex has the lowest molar conductivity?
Which of the following complex has the lowest molar conductivity?
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Compounds with ligands only inside the coordination brackets and no external ions (like $Cl, K, NO_3$ outside) are neutral and do not conduct electricity.
Updated On: Jun 26, 2026
- Dichlorotetrammineplatinum(IV) chloride
- Dichlorotetramminecobalt(III) chloride
- Potassium hexacyanidoferrate(II)
- Hexaaquochromium(III) chloride
- Pentacarbonyliron(0) has the lowest molar conductivity
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The Correct Option is
Solution and Explanation
Step 1: Understanding the Concept:
Molar conductivity depends on the number of ions produced by the complex when dissolved in water. Non-electrolytes (complexes that do not ionize) have zero or the lowest molar conductivity.
Step 2: Detailed Explanation:
1. $[Pt(NH_3)_4Cl_2]Cl_2 \rightarrow [Pt(NH_3)_4Cl_2]^{2+} + 2Cl^-$ (3 ions).
2. $[Co(NH_3)_4Cl_2]Cl \rightarrow [Co(NH_3)_4Cl_2]^+ + Cl^-$ (2 ions).
3. $K_4[Fe(CN)_6] \rightarrow 4K^+ + [Fe(CN)_6]^{4-}$ (5 ions).
4. $[Cr(H_2O)_6]Cl_3 \rightarrow [Cr(H_2O)_6]^{3+} + 3Cl^-$ (4 ions).
5. $[Fe(CO)_5]$ is a homoleptic carbonyl complex. Carbonyl ligands are neutral and stay inside the coordination sphere. There is no ionizable part outside, so it is a non-electrolyte (produces 0 ions).
Step 3: Final Answer:
Pentacarbonyliron(0) has the lowest molar conductivity.
Molar conductivity depends on the number of ions produced by the complex when dissolved in water. Non-electrolytes (complexes that do not ionize) have zero or the lowest molar conductivity.
Step 2: Detailed Explanation:
1. $[Pt(NH_3)_4Cl_2]Cl_2 \rightarrow [Pt(NH_3)_4Cl_2]^{2+} + 2Cl^-$ (3 ions).
2. $[Co(NH_3)_4Cl_2]Cl \rightarrow [Co(NH_3)_4Cl_2]^+ + Cl^-$ (2 ions).
3. $K_4[Fe(CN)_6] \rightarrow 4K^+ + [Fe(CN)_6]^{4-}$ (5 ions).
4. $[Cr(H_2O)_6]Cl_3 \rightarrow [Cr(H_2O)_6]^{3+} + 3Cl^-$ (4 ions).
5. $[Fe(CO)_5]$ is a homoleptic carbonyl complex. Carbonyl ligands are neutral and stay inside the coordination sphere. There is no ionizable part outside, so it is a non-electrolyte (produces 0 ions).
Step 3: Final Answer:
Pentacarbonyliron(0) has the lowest molar conductivity.
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