In a coordination compound,the coordination number of the metal is equal to:

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:

The coordination number and the oxidation state of the element $E$ in the complex $[E(en)_2(C_2O_4)]NO_2$ (where $en$ is ethylene diamine) are,respectively:

In the complex $[Pt(en)_2]^{2+}$,the coordination number and oxidation state of the central metal ion are,respectively:

The number of unidentate ligands attached to the central metal ion in a complex is called:

What is the chemical formula of sodium nitroprusside?