Assign $A, B, C, D$ from the given type of reaction: $AgI \downarrow + 2Na_2S_2O_3 \longrightarrow Na_3[Ag(S_2O_3)_2] + NaI$

The reaction of $Pb(NO_3)_2$ and $NaCl$ in water produces a precipitate that dissolves upon the addition of $HCl$ of appropriate concentration. The dissolution of the precipitate is due to the formation of

Which of the following ligands does not show synergic bonding with a central metal atom?

$Ni^{2+}$ ion can be estimated by using dimethyl glyoxime and forms a cherry-red precipitate. The complex is stabilized by

Choose the correct statements from the following:
$A$. Ethane$-1, 2-$diamine is a chelating ligand.
$B$. Metallic aluminium is produced by electrolysis of aluminium oxide in the presence of cryolite.
$C$. Cyanide ion is used as a ligand for the leaching of silver.
$D$. Phosphine acts as a ligand in Wilkinson's catalyst.
$E$. The stability constants of $Ca^{2+}$ and $Mg^{2+}$ are similar with $EDTA$ complexes.
Choose the correct answer from the options given below:

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