The number of hydrogen-bonded water molecule$(s)$ associated with the stoichiometry $CuSO_{4} \cdot 5H_{2}O$ is .... .

Choose the incorrect stability order.

Which of the following complexes will be the most stable?

Which one will give $Fe^{3+}$ ions in solution?

The molecular formula of a cobalt coordination complex contains five ammonia molecules,one nitro group,and two chlorine atoms for one cobalt atom. In an aqueous solution,one mole of the substance produces $3$ moles of ions. Upon reacting this solution with an excess of silver nitrate solution,$2$ moles of $AgCl$ precipitate are obtained. What is the ionic formula of the complex?

The molar ionic conductances of the octahedral complexes are in the order of:
$(1) PtCl_4 \cdot 5NH_3$
$(2) PtCl_4 \cdot 4NH_3$
$(3) PtCl_4 \cdot 3NH_3$
$(4) PtCl_4 \cdot 2NH_3$