Question

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

Options

• [Co(NH₃)₃Cl₃]

• [Co(NH₃)₄Cl₂]

• [Co(NH₃)₆]Cl₃

• [Co(NH₃)₅Cl]Cl

Answer 1

[Co(NH₃)₃Cl₃]

Explanation:

• Conductance in an aqueous solution depends on the number of ions produced.
• [Co(NH₃)₃Cl₃] is a neutral complex (non-electrolyte). Because it does not dissociate into ions in water, it provides the minimum conductance.
• In a complex, only the groups outside the square brackets [...] can dissociate (break away) into ions when dissolved in water. Groups inside remain tightly bound to the metal.
• The other compounds are electrolytes that dissociate into ions, thereby increasing conductance.