In potassium trioxalatoaluminate $(III)$, what are the primary and secondary valency of the central atom respectively?

What is the number of ions produced by $[Pt(NH_3)_4Cl_2]Cl_2$ in an aqueous solution?

Which of the following complexes will give a white precipitate with $BaCl_2$ $(aq.)$?

Given below are two statements :
Statement $I$ : $[Co(NH_3)_6]^{3+}$ is a homoleptic complex whereas $[Co(NH_3)_4 Cl_2]^{+}$ is a heteroleptic complex.
Statement $II$ : Complex $[Co(NH_3)_6]^{3+}$ has only one kind of ligands but $[Co(NH_3)_4 Cl_2]^{+}$ has more than one kind of ligands.
In the light of the above statements,choose the correct answer from the options given below.

What is the number of $=N-OH$ groups present in dimethyl glyoximato?

The coordination number and oxidation state of $Cr$ in $K_3[Cr(C_2O_4)_3]$ are respectively