In the complex ion $[Fe(C_2O_4)_3]^{3-}$,the coordination number of $Fe$ is

Which of the following compounds contains both complex cations and complex anions?

The ligand $N[CH_2CH_2NH_2]_3$ is a:

Given below are two statements :
Statement $I :$ The identification of $Ni^{2+}$ is carried out by dimethyl glyoxime in the presence of $NH_{4}OH$.
Statement $II :$ The dimethyl glyoxime is a bidentate neutral ligand.
In the light of the above statements,choose the correct answer from the options given below:

Which of the following pairs of complexes gives pale yellow and white precipitates respectively when their aqueous solutions are treated with $0.1 \ M \ AgNO_3$?

$A$ $1:3$ electrolyte in an aqueous solution is