1. [Co(NH₃)₃Cl₃] 2. [Co(NH₃)₄Cl₂] 3. [Co(NH₃)₆]Cl₃ 4. [Co(NH₃)₅Cl]Cl

Answer: 1. [Co(NH₃)₃Cl₃] or 2. [Co(NH₃)₄Cl₂] Key idea: conductance in solution depends on the number of ions produced; a non-electrolyte gives the least. [Co(NH₃)₃Cl₃] : neutral complex (all Cl inside the sphere), gives no ions, so minimum conductance. [Co(NH₃)₆]Cl₃ : 4 ions; [Co(NH₃)₅Cl]Cl : 3 ions. [Co(NH₃)₄Cl₂] as printed has a +1 charge on Co(III) with no counter ion; it is meant to be [Co(NH₃)₄Cl₂]Cl (2 ions) and the official key accepts it as well. Best answer by chemistry: option (1); the key accepts options (1) and (2).

Topic: Werner's theory, ligands, coordination number, denticity, chelation· Coordination Compounds

Out of the following complex compounds, which of the compound will be having the minimum conductance in solution?

1. \([\mathrm{Co(NH_3)_3Cl_3}]\)

2. \([\mathrm{Co(NH_3)_4Cl_2}]\)

3. \([\mathrm{Co(NH_3)_6}]\mathrm{Cl_3}\)

4. \([\mathrm{Co(NH_3)_5Cl}]\mathrm{Cl}\)

Doubtly Asked 30 Oct 2026 NEET UG 2025 Practice test neet Save WhatsApp Report

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Answer: 1. \([\mathrm{Co(NH_3)_3Cl_3}]\) or 2. \([\mathrm{Co(NH_3)_4Cl_2}]\)

Key idea: conductance in solution depends on the number of ions produced; a non-electrolyte gives the least.

\(\mathrm{[Co(NH_3)_3Cl_3]}\): neutral complex (all Cl inside the sphere), gives no ions, so minimum conductance.
\(\mathrm{[Co(NH_3)_6]Cl_3}\): 4 ions; \(\mathrm{[Co(NH_3)_5Cl]Cl}\): 3 ions.
\(\mathrm{[Co(NH_3)_4Cl_2]}\) as printed has a +1 charge on Co(III) with no counter ion; it is meant to be \(\mathrm{[Co(NH_3)_4Cl_2]Cl}\) (2 ions) and the official key accepts it as well.

Best answer by chemistry: option (1); the key accepts options (1) and (2).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Out of the following complex compounds, which of the compound will be having the minimum conductance in solution?

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