Question

Which of the following shows maximum molar conductance?

• A. [Co(NH3)6]Cl3
• B. [Co(NH3)3Cl3]
• C. [Co(NH3)4 Cl2]Cl
• D. [Co(NH3)5Cl]Cl2

Answer 1

Answer: (A)

$Co(NH3)6$Cl3

Answer 2

Molar conductance depends not only on the number of ions in aqueous solution but also on the electrical charges on the ions.

[Co(NH3)6]Cl3 [Co(NH3)6]3+ (aq) + 3Cl– (aq). It has 4 ions and six electrical charges.

[Co(NH3)3Cl3] [Co(NH3)3Cl3] (aq) (neutral)

[Co(NH3)4 Cl2] Cl [Co(NH3)4 Cl2] + (aq) + Cl– (aq). It has 2 ions and two electrical charges.

[Co(NH3)5Cl]Cl2 [Co(NH3)5Cl]2+ (aq) + 2Cl– (aq). It has 3 ions and four electrical charges.