JEE MAIN - Chemistry (2022 - 27th June Evening Shift - No. 7)
Arrange the following coordination compounds in the increasing order of magnetic moments. (Atomic numbers : Mn = 25; Fe = 26)
A. [FeF6]3$$-$$
B. [Fe(CN)6]3$$-$$
C. [MnCl6]3$$-$$ (high spin)
D. [Mn(CN)6]3$$-$$
Choose the correct answer from the options given below :
A < B < D < C
B < D < C < A
A < C < D < B
B < D < A < C
Explanation
| Coordination Compound | Number of unpaired e– (n) | Magnetic moment (µ) (B.M) |
|---|---|---|
| A. [FeF6]3$$-$$ - d5 | 5 | 5.91 |
| B. [Fe(CN)6]3$$-$$ - d5 | 1 | 1.73 |
| C. [MnCl6]3$$-$$ - d4 | 4 | 4.89 |
| D. [Mn(CN)6]3$$-$$ - d4 | 2 | 2.82 |
Hence, correct order of magnetic moment is $2 < 4 < 3 < 1$
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