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(C) . Ethane$-1, 2-$diamine $(en)$ is a bidentate ligand that forms a ring structure,hence it is a chelating ligand. (Correct)$B$. Metallic aluminium

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$A, B, C$ only

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(C) . Ethane$-1, 2-$diamine $(en)$ is a bidentate ligand that forms a ring structure,hence it is a chelating ligand. (Correct)$B$. Metallic aluminium is produced by the Hall-Heroult process,which involves the electrolysis of alumina $(Al_2O_3)$ dissolved in molten cryolite $(Na_3AlF_6)$. (Correct)$C$. Cyanide ion $(CN^-)$ is used in the hydrometallurgical extraction (leaching) of silver: $Ag_2S + 4NaCN \rightarrow 2Na[Ag(CN)_2] + Na_2S$. (Correct)$D$. Wilkinson's catalyst is $[RhCl(PPh_3)_3]$,where triphenylphosphine $(PPh_3)$ acts as a ligand. (Correct)$E$. The stability constant of $Ca^{2+}-EDTA$ complex is higher than that of $Mg^{2+}-EDTA$ complex. (Incorrect)Therefore,statements $A, B, C,$ and $D$ are correct. However,based on the provided options,the most appropriate choice containing correct statements is $C$ ($A, B, C$ only).

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