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 match the elements in List-I with the correct descriptions in List-II, we must understand the properties and associations of the given elements and terms. Here is the detailed analysis and reasoning:

• (A) Mn²⁺ - Highest oxidation states: Manganese (Mn) can exhibit a variety of oxidation states. Mn²⁺ is a stable oxidation state but is not the highest. However, in the context of providing a match with List-II, given "highest oxidation states" typically refers to manganese's capability to reach +7 oxidation state in compounds like KMnO₄, the description aligns with Mn²⁺ as part of the complexity in the manganese series.
• (B) Spin only Magnetic Moment (III) μ_s = √n(n + 2) BM: This equation calculates the spin-only magnetic moment. It applies to transition metal ions like Mn²⁺, which due to unpaired electrons exhibit a magnetic moment. The match is direct with description III, as it's the formula for calculating the spin-only magnetic moment based on unpaired d-electrons:
• (C) MnO₂ - Pyrolusite ore (I): MnO₂ is known as Pyrolusite, a major ore of manganese. Hence, the correct match for MnO₂ is 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 widely used in lighter flints and various metallurgical applications, typically composed of rare earth elements (4f metals) including lanthanum (La) and cerium (Ce), along with iron and other elemental traces.

Conclusion: Based on the above analysis, the correct match is: (A)- (IV), (B)- (III), (C)- (I), (D)- (II)

Answer 2

(A) Mn²⁺: Manganese in the +2 oxidation state \(({Mn}^{2+})\)is associated with the highest oxidation states of manganese, specifically in the context of its other oxidation states. Therefore, it matches with (IV).

(B) Spin-only magnetic moment: The formula for the spin-only magnetic moment is given by \(\mu_s = \sqrt{n(n+2)}\), where n is the number of unpaired electrons. This matches with (III).

(C) MnO₂: Manganese dioxide \(({MnO_2})\) is also known as pyrolusite ore, which is the primary source of manganese. Therefore, it matches with (I).

(D) Misch metal: Misch metal is an alloy of 4f metals (lanthanides), iron, and small amounts of sulfur, carbon, aluminum, and calcium. This matches with (II).

Thus, the correct matching is: (A) - (IV), (B) - (III), (C) - (I), (D) - (II)

Therefore, the correct answer is Option C.