Question

Match List-I with List-II:

List-I	List-II
(A) Mn2+	(I) Pyrolusite ore
(B) Spin only Magnetic Moment	(II) An alloy of 4f metal, iron and traces of S, C, Al and Ca
(C) MnO2	(III) μs = √n(n + 2) BM
(D) Misch metal	(IV) Highest oxidation states

Choose the correct answer from the options given below:

• A. (A)- (IV), (B)- (III), (C)- (II), (D)- (I)
• B. (A)- (II), (B)- (III), (C)- (I), (D)- (IV)
• C. (A)- (IV), (B)- (III), (C)- (I), (D)- (II)
• D. (A)- (I), (B)- (III), (C)- (IV), (D)- (II)

Answer 1

The Correct Option is C

To correctly associate elements in List-I with descriptions in List-II, an understanding of their properties and relationships is necessary. The following provides a detailed breakdown and justification:

• (A) Mn²⁺ - Highest oxidation states: While Mn²⁺ is a stable oxidation state for manganese (Mn), it is not its highest possible state. However, in the context of matching with List-II, the phrase "highest oxidation states" likely refers to manganese's potential to achieve states up to +7 (e.g., in KMnO₄). Therefore, Mn²⁺ is considered in relation to the overall manganese oxidation state spectrum.
• (B) Spin only Magnetic Moment (III) μ_s = √n(n + 2) BM: This formula quantifies the spin-only magnetic moment, applicable to transition metal ions such as Mn²⁺. The presence of unpaired electrons in these ions gives rise to a magnetic moment. This directly corresponds to description III, which presents the formula for calculating the spin-only magnetic moment based on unpaired d-electrons.
• (C) MnO₂ - Pyrolusite ore (I): MnO₂ is identified as Pyrolusite, a primary ore from which manganese is extracted. Thus, MnO₂ matches with Pyrolusite ore.
• (D) Misch metal - An alloy of 4f metal, iron and traces of S, C, Al and Ca (II): Misch metal is an alloy commonly employed in lighter flints and various metallurgical applications. Its composition typically includes rare earth elements (4f metals) such as lanthanum (La) and cerium (Ce), alongside iron and minute quantities of other elements.

Conclusion: The analysis leads to the following correct pairings: (A)- (IV), (B)- (III), (C)- (I), (D)- (II)