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Solution


Q.

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 ligand for leaching of silver.
(D) Phosphine act as a ligand in Wilkinson catalyst.
(E) The stability constants of Ca2+ and Mg2+ are similar with EDTA complexes.

Choose the correct answer from the options given below:                                 [2024]
1 (B), (C), (E) only  
2 (C), (D), (E) only  
3 (A), (B), (C) only  
4 (A), (D), (E) only  

Ans.

(3)

(A) Ethane-1,2-diamine being a didentate ligand is a chelating ligand.

(B) Metallic aluminium is produced by the electrolysis of aluminium oxide. This process of electrolysis is known as the Hall-Heroult process.

(C) In the metallurgy of silver and of gold, the respective metal is leached with a dilute solution of NaCN or KCN in the presence of air (for O2) from which the metal is obtained later by replacement using zinc:

4M(s)+8CN-(aq)+2H2O(aq)+O2(g)→4[M(CN)2]-(aq)+4OH-(aq)  (M=Ag or Au)

2[M(CN)2]-(aq)+Zn(s)→[Zn(CN)4]2-(aq)+2M(s)

(D) In Wilkinson catalyst [(Ph3P)3RhCl], the ligand is triphenylphosphine (not phosphine).

(E) Sodium salt of EDTA is used to estimate the hardness of water i.e., to determine the amount of Ca2+ and Mg2+ in water. EDTA forms a stable complex with both Ca2+ and Mg2+. However, Kf[Ca(EDTA)]2->Kf[Mg(EDTA)]2-