Question

Match List I with List II

List I (Ions)	List II (Magnetic moment (BM))
A. Co2+	I. 1.73
B. Mn2+	II. 3.87
C. Cr2+	III. 4.90
D. Cu2+	IV. 5.92

Choose the correct answer from the options given below:

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

Hint:

Magnetic moments correspond to the number of unpaired electrons in the ion’s electronic configuration.

Answer 1

The Correct Option is A

Ionic magnetic moments are determined by the quantity of unpaired electrons in their electronic structures. Provided below are the magnetic moments and corresponding electronic configurations for several ions:

• (A) \( \text{Co}^{2+} \) exhibits a magnetic moment of 3.87 BM, correlating to 3 unpaired electrons.
• (B) \( \text{Mn}^{2+} \) displays a magnetic moment of 5.92 BM, indicative of 5 unpaired electrons.
• (C) \( \text{Cr}^{2+} \) shows a magnetic moment of 4.90 BM, corresponding to 4 unpaired electrons.
• (D) \( \text{Cu}^{2+} \) presents a magnetic moment of 1.73 BM, reflecting 1 unpaired electron.