NEETChemistryd and f Block Elements
Match List-I with List-II: List-I List-II (A) Ce ⁴⁺ (I) Strong reducing agent (B) Eu ²⁺ (II) Radioactive lanthanoid (C) Lu ³⁺ (III) Good analytical reagent (D) Pm (IV) Diamagnetic with completely filled f-orbital Choose the correct answer from the options given below:
Options
- A(A)-(I), (B)-(III), (C)-(IV), (D)-(II)
- B(A)-(III), (B)-(I), (C)-(II), (D)-(IV)
- C(A)-(IV), (B)-(I), (C)-(III), (D)-(II)
- D(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
Correct answer
D. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
Step-by-step solution
(A) Ce ⁴⁺ is widely used as a good analytical reagent in volumetric analysis because it can easily accept an electron to form the stable Ce ³⁺ ion, acting as an oxidising agent. (B) Eu ²⁺ acts as a strong reducing agent because it tends to lose an electron to achieve the most stable +3 oxidation state characteristic of lanthanoids. (C) Lu ³⁺ has the electronic configuration [ Xe ] 4 f ¹⁴ . Since all its f-electrons are paired, it is diamagnetic. (D) Promethium ( Pm ) is the only radioactive element among the lantha