Question

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 presence of cryolite.
C Cyanide ion is used as a ligand for leaching of silver.
D Phosphine acts as a ligand in Wilkinson catalyst.
E The stability constants of $\text{Ca}^{2+}$ and $\text{Mg}^{2+}$ are similar to EDTA complexes.

• A. (B), (C), (E) only
• B. (A), (B), (C) only
• C. (B), (C), (D), (E) only
• D. (A), (B), (C), (D), (E)

Answer 1

Answer: (C)

(B), (C), (D), (E) only

Answer 2

(B) Metallic aluminium is produced by electrolyzing alumina in the presence of cryolite, which lowers the melting point and increases conductivity
(C) Cyanide ion is used in the leaching process of silver as it forms a soluble complex with silver.
(D) Phosphine (PH3) acts as a ligand in Wilkinson’s catalyst, which is used for hydrogenation.
(E) The stability constants of Ca2+ and Mg2+ with EDTA are quite similar, making EDTA effective for chelating these ions.