Coordination CompoundHard
Question
Which complex of the following pairs has the larger value of ᐃ0 ?
(i) [Co(CN)6]3- and [Co(NH3)6]3+
(ii) [Co(H2O)6]3+ and [Rh(H2O)6]3+
(iii) [Co(H2O)6]3+ and [Co(H2O)3 ]3+
(iv) [Co(NH3)6]3+ and [CoF6]3-
(i) [Co(CN)6]3- and [Co(NH3)6]3+
(ii) [Co(H2O)6]3+ and [Rh(H2O)6]3+
(iii) [Co(H2O)6]3+ and [Co(H2O)3 ]3+
(iv) [Co(NH3)6]3+ and [CoF6]3-
Options
A.[Co(CN)6]3- > [Co(H2O)6]3+
B.[Co(H2O)6]2+ < [Co(H2O)6]3+
C.[Co(H2O)6]3+ > [Rh(H2O)6]3+
D.[Co(NH3)6]3+ < [CoF6]3-
Solution
ᐃ0 depends on (A) strength of ligands ; CN- > NH3-
(B) oxidation state of metal ; Co3+ > Co2+
ᐃ0 also increases down the group due to increasing effective nuclear charge
(B) oxidation state of metal ; Co3+ > Co2+
ᐃ0 also increases down the group due to increasing effective nuclear charge
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