The number of ions formed when cuprammonium sulphate is dissolved in water is

What is the coordination number of $Fe$ in $[Fe(CN)_6]^{3-}$?

Identify the cationic complex from the following.

Which of the following complexes gives only $25\%$ mole of $AgCl$ precipitate when reacted with excess $AgNO_3$?

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.

Consider the complex $[Co(NH_3)_4 CO_3]ClO_4$. The coordination number,oxidation number,and number of $d$-electrons on the metal are respectively: