How many ions will be produced in solution from one molecule of pentamminechlorocobalt$(III)$ chloride?

Ferrous ammonium sulphate aqueous solution consists of:

$A$ $2 \ L$ solution is prepared by mixing $0.02 \ mol$ of $[Co(NH_3)_5SO_4]Br$ and $0.02 \ mol$ of $[Co(NH_3)_5Br]SO_4$. If $1 \ L$ of this mixture $X$ is treated with $AgNO_3$ to give $Y$,and another $1 \ L$ of mixture $X$ is treated with $BaCl_2$ to give $Z$,find the moles of $Y$ and $Z$.

Which of the following will give $Fe^{3+}$ ions in solution?

Consider the following statements according to Werner's theory:
$(a)$ Ligands are connected to the metal ions by coordinate bonds.
$(b)$ Secondary valencies have directional properties.
$(c)$ Secondary valencies are non-ionisable.
Of these statements:

What is the number of electrons lost by $Cr$ in a complex $[Cr(CO)_6]$?