Choose the correct Statements from the following: (A) Ethane - 1, 2...

Statement A

Ethane−$1, 2$−diamine is a chelating agent as it contains two coordinating sites that are two nitrogen atoms which donate their lone pairs of electrons and can form a $5$-membered ring with the metal ion.$</p><p><img src="https://cdn-question-pool.Quantrex.app/pyq/jee_main/629937b4-3c39-49d1-ace0-588d6ec911bb.png" style="width: 307px; height: 108px;"/></p><p>Statement B</p><p>Based on Hall-Heroults process-</p><p>The Hall-Heroult process is widely used in the extraction of aluminium. In Hall-Heroults process, pure${Al}_{2}{O}_{3}$is mixed with${CaF}_{2}or{Na}_{3}{AlF}_{6}$. This results in lowering the melting point of the mixture and increases its ability to conduct electricity.  A steel vessel with a lining of carbon and graphite rods is used.$

Statement C

Cyanide ion is used as ligand for leaching of silver.

The cyanide process, which is also known as the Macarthur-forest process, is widely used in extracting gold or silver from the ores by dissolving them in a dilute solution of potassium cyanide or sodium cyanide.

Statement D 

$\left[Rh{\left({\text{ PPh }}_{3}\right)}_{3}Cl\right]$ Wilkinson's catalyst$</p><p>Statement E</p><p>${Ca}^{+ +}$ion forms more stable complex with EDTA$

Hence option C is the answer.