In ${K_4}[Fe(CN)_6]$,$Fe$ is in the form of

Which of the following is the correct order in the spectrochemical series of ligands?

Which of the following complexes is octahedral,diamagnetic,and the most stable?

Arrange the following complexes in the increasing order of conductivity of their solution:
$[Co(NH_{3})_{3}Cl_{3}], [Co(NH_{3})_{4}Cl_{2}]Cl, [Co(NH_{3})_{6}]Cl_{3}, [Cr(NH_{3})_{5}Cl]Cl_{2}$

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

The brown ring test for $NO_2^-$ and $NO_3^-$ ions is due to the formation of which of the following complex ions?