A complex ion [M(en)2(NH3)2]Cl2 shows geometrical isomerism and exists in cis and trans forms. If the cis isomer shows optical activity, the configuration around the central metal ion M is:

Upon adding excess $AgNO_3$ to $CoCl_3.4NH_3$, how many moles of $AgCl$ are formed?

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

A group of atoms can function as a ligand only when

Ammonia gas does not evolve from the complex ${\rm{FeC}}{{\rm{l}}_3}.\,4{\rm{N}}{{\rm{H}}_3}$ but is gives white precipitate with aqueous solution of ${\rm{AgN}}{{\rm{O}}_3}.$ Coordination number of central metal ion in above complex is six. Give IUPAC name of the complex.

Which one of the following forms with an excess of ${\rm{C}}{{\rm{N}}^ - }$ (cyanide) a complex?

Which one does not belong to ligand?

Among the following, identify the species with an atom of +6 oxidation state:

Which of the following statements is correct?

Which of the following is a common donor atom in ligands?

The coordination number and oxidation number of $X$ in the following compound $\left[ {X\left( {{\rm{S}}{{\rm{O}}_4}} \right){{\left( {{\rm{N}}{{\rm{H}}_3}} \right)}_5}} \right]{\rm{Cl\;}}$ will be