How many ions are produced in aqueous solution of $[Co(H_2O)_6]Cl_2$?

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 is the odd one out?

The formula of the complex hydridotrimethoxyborate$(III)$ ion is:

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

Consider the following complex: $[Co(CO_3)(NH_3)_5]ClO_4$.
Mark the correct option for the following parameters in order:
Coordination number $-$ Oxidation number $-$ Number of $d$-electrons $-$ Number of unpaired $d$-electrons.