COMEDK202510 May 2025Morning ShiftChemistryCoordination CompoundsActual
Arrange the following compounds in the decreasing order of the molar conductivities of their aqueous solutions. array cccc A & B & C & D [ Co ( NH ₃ )₅ Cl ] Cl ₂ . & [ Co ( NH ₃ )₃ Cl ₃ ] & [ Co ( NH ₃ )₄ Cl ₂ ] Cl & [ Co ( NH ₃ )₆ ] Cl ₃ array
Options
- AB > A > C > D
- BB > C > A > D
- CD>A>C>B
- DA > B > D > C
Correct answer
C. D>A>C>B
Step-by-step solution
Molar conductivity of an electrolyte in aqueous solution depends on the number of ions produced upon dissociation. The greater the number of ions, the higher the molar conductivity. Dissociation of the given complexes: A: [Co(NH₃)₅Cl]Cl₂ [Co(NH₃)₅Cl]²⁺ + 2Cl⁻ . Total ions = 3. B: [Co(NH₃)₃Cl₃] [Co(NH₃)₃Cl₃] . Total ions = 0 (non-electrolyte). C: [Co(NH₃)₄Cl₂]Cl [Co(NH₃)₄Cl₂]⁺ + Cl⁻ . Total ions = 2. D: [Co(NH₃)₆]Cl₃ [Co(NH₃)₆]³⁺ + 3Cl⁻ . Total ions = 4. Comparing the number of ions produced: D (4 ions) > A (3 ions)