$CuSO_4$ solution reacts with excess of $KCN$ solution to form:

Pick out from the following complex compounds,a poor electrolytic conductor in solution.

Which of the following complexes represents maximum stability?

$CuSO_4$ reacts with $KCN$ solution and forms

Explain the chelating effect or chelation.

Calculate the overall complex dissociation equilibrium constant for the $Cu(NH_3)_4^{2+}$ ion,given that $\beta_4$ for this complex is $2.1 \times 10^{13}$.