Question

Fe[(h2O)6]2+ and Ru([h2O)6]2+ are different rate constant.. why??

Answer 1

[Fe(H2O)6]2+ and [Fe(CN)6]4− differ...

Both Fe(H2O)6]2+ and [Fe(CN)6]4  have d6 configuration. Fe(H2O)6]2+ is a high spin complex and contains 4 unpaired electrons. Hence it is paramagnetic. Its magnetic moment is 5.4 B.M . It has pale green color. [Fe(CN)6]4 is a low spin complex and all electrons are paired. Hence it is diamagnetic. Its magnetic moment is 0 B.M. It is colorless.