When $AgCl$ is treated with $KCN$, what happens?

Identify the correct statements from the following:
$A$. $[Fe(C_2O_4)_3]^{3-}$ is the most stable complex among $[Fe(OH)_6]^{3-}$, $[Fe(C_2O_4)_3]^{3-}$ and $[Fe(SCN)_6]^{3-}$.
$B$. The stability of $[Cu(NH_3)_4]^{2+}$ is greater than that of $[Cu(en)_2]^{2+}$.
$C$. The hybridization of $Fe$ in $K_4[Fe(CN)_6]$ is $d^2sp^3$.
$D$. $[Fe(NO_2)_3Cl_3]^{3-}$ exhibits linkage isomerism.
$E$. $NO_2^-$ and $SCN^-$ ligands are $NOT$ ambidentate ligands.
Choose the correct answer from the options given below:

When ammonia is added to a cupric salt solution,the deep blue colour is observed; it is due to the formation of

What is the final product formed when copper sulphate solution reacts with excess $KCN$?

If $NaOH$ is added to an aqueous solution of zinc ions,a white precipitate appears and on adding excess $NaOH$,the precipitate dissolves. In this solution,zinc exists in the

The stabilization of coordination compounds due to chelation is called the chelate effect. Which of the following is the most stable complex species?